J. Robert Oppenheimer “Inventor of Bomb” and Henry Moseley “Discoverer of Atom-Number”

nventor of nuclear bomb and atomic number
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Basic InformationJ. Robert OppenheimerHenry Moseley
Date of Birth22nd April 190423rd November 1887
Place of BirthNew York City, New York, U.S.Weymouth, Dorset, England
Date of Death18th February 196710th August 1915
Place of DeathPrinceton, New Jersey, U.S.Gallipoli, Ottoman Turkey
Cause of DeathCancer in throatKilled in an action
Age62 years old27 years old
SchoolEthical Culture Society School.Summer Fields School
High School / CollegeHarvard CollegeTrinity College
UniversityChrist College, Cambridge University of GottingenThe University of Oxford, University of Manchester
OccupationScientist, inventor, Nuclear physicsScientist, Inventor, Physics, and Chemistry
Career1927 – 19671910 – 1915
Famous forNuclear weapons development, Tolman Oppenheimer Volkoff limit, Oppenheimer–Phillips process, Born Oppenheimer, approximationAtomic number, Moseley’s law
TitleInventor of BombThe inventor of Atomic number
Other worksThe University of California, California Institute of Technology, Los Alamos Laboratory, Institute for Advanced StudyX-ray Spectrometer  
SpouseKatherine “Kitty” PueningN / A
AwardsEnrico Fermi Award (1963)Matteucci Medal (1919)


Many of the scientists written about J. Robert Oppenheimer who was the physicist, the substance of his life, his intellect, patrician manner, the leadership of the Los Alamos National laboratory, politician, postwar and he died from cancer which is a highly complicated story[1]. On the other hand, Henry Mosely was an English Physicist, who pay to the discipline of astronomy was the explanation from the rules of the preceding experiential and the organic idea of the submicroscopic amount. This restricted beginning his growth of Moseley’s law in X-ray Scales. Moseley’s law progressive the microscopic quantum mechanics and the significant physical science by provided that the first investigational indication in the indulgence of Niels Bohr’s philosophy.  

J. Robert Oppenheimer:

Early life and education:

J. Robert Oppenheimer was born on 22nd April 1904 in New York, New York City, U.S. Oppenheimer was grown up in a Manhattan apartment, His father name was Julius Oppenheimer was a German settler who worked in the textile importing business. His mother’s name was Ella Friedman was a painter whose family was being lived in New York. His younger brother’s name was Frank who was also a physicist[2].

J. Robert Oppenheimer - WW II, Atomic Bomb
J. Robert Oppenheimer – WW II, Atomic Bomb

He got his early education from the Ethical Culture society school in the year 1911. This school had been formed by Felix Adler for promoting the form of ethical training which was based on the Ethical Culture movement of which basic purpose was “Deed before Creed”. His father has remained a member for many years and he served about 9 years there from 1907 – 1915. He was interested in the Chemistry subject and got admission to Harvard College at the age of 18 years old. He got admission after one year due to the disease of Colitis in the summer vacation. His father took him to the English teacher Herbert Smith who take him to New Mexico where he fell in love with horseback riding and the southwestern United States[2].

His major subject was Chemistry but he requires the students of the science who also know the history of science, literature, philosophy, and mathematics. He chooses 6 subjects in the 1st year and entered into the undergraduate honor society Phi Beta Kappa[2].

Education from Europe:

In 1924, Oppenheimer was educated that he had been acknowledged into Christ’s College, Cambridge. He kept in touch with Ernest Rutherford mentioning authorization to work at the Cavendish Laboratory. Bridgman gave Oppenheimer a proposal, which surrendered that Oppenheimer’s awkwardness in the lab made it obvious his specialty was not trial yet rather hypothetical material science. Rutherford was disinterested; however, Oppenheimer went to Cambridge in the expectation of handling another offer. He was eventually acknowledged by J. J. Thomson on the condition that he complete an essential lab course. He built up a hostile relationship with his coach, Patrick Blackett, who was a couple of years his senior. While on an extended get-away, as reviewed by his companion Francis Fergusson, Oppenheimer once admitted that he had left an apple drenched with poisonous synthetic compounds around Blackett’s work area. While Fergusson’s record is the main nitty-gritty adaptation of this function, Oppenheimer’s folks were alarmed by the college specialists who considered setting him waiting on the post-trial process, a destiny forestalled by his folks effectively campaigning the authorities[2].

Oppenheimer was a tall, flimsy chain smoker, who regularly fail to eat during times of extraordinary idea and focus. A considerable lot of his companions depicted him as having pointless propensities. An upsetting function happened when he got away from his investigations in Cambridge to get together with Fergusson in Paris. Fergusson saw that Oppenheimer was not well. To help occupy him from his downturn, Fergusson disclosed to Oppenheimer that he (Fergusson) was to wed his better half, Frances Keeley. Oppenheimer didn’t take the news well. He hopped on Fergusson and attempted to choke him. Even though Fergusson handily battled off the assault, the scene persuaded him regarding Oppenheimer’s profound mental inconveniences. For a mind-blowing duration, Oppenheimer was tormented by times of depression, and he once told his sibling, “I need material science more than friends”[2].

In 1926, Oppenheimer left Cambridge for the University of Göttingen to concentrate under Max Born. Göttingen was one of the world’s driving communities for hypothetical material science. Oppenheimer made companions who went on to extraordinary achievements, including Werner Heisenberg, Pascual Jordan, Wolfgang Pauli, Paul Dirac, Enrico Fermi, and Edward Teller. He was known for being excessively eager in conversation, now and then to the point of assuming control over course sessions. This aggravated a portion of Born’s different understudies so much that Maria Goeppert gave Born an appeal marked without anyone else and others undermining a blacklist of the class except if he made Oppenheimer calm down. Brought into the world forgot about it around his work area where Oppenheimer could understand it, and it was compelling without a word being said[2].

He acquired his Doctor of Philosophy degree in March 1927 at age 23, regulated by Born. After the oral test, James Franck, the educator managing, allegedly stated, “I’m happy that is finished. He was about to start addressing me.” Oppenheimer distributed more than 12 papers at Göttingen, including numerous significant commitments to the new field of quantum mechanics. He and Born distributed a well-known paper on the Born Oppenheimer estimate, which isolates atomic movement from electronic movement in the numerical treatment of particles, permitting atomic movement to fail to improve computations. It remains his most referred to work[2].

Smart introduction:

J. Robert Oppenheimer was an American hypothetical physicist and teacher of material science at the University of California, Berkeley. Oppenheimer was the wartime top of the Los Alamos Laboratory and is among the individuals who are credited with being the “father of the nuclear bomb” for their function in the Manhattan Project, the World War II undertaking that built up the principal atomic weapons. The primary nuclear bomb was effectively exploded on 16th July 1945, in the Trinity test in New Mexico[2].

The Life of J. Robert Oppenheimer, Imagined Through His Collisions With Others
The Life of J. Robert Oppenheimer, Imagined Through His Collisions With Others

Manhattan Project:

Oppenheimer became politically active in the year 1930. Albert Einstein and Leo Szilard that the Nazis could develop a nuclear weapon. Early in the year 1939 invasion of Poland by Nazi Germany, Oppenheimer was selected as an administrator and came here for atomic energy and military purpose. He became the scientific end of the Manhattan Project in Los Alamos, New Mexico at the start of the year 1942. This project was liked by many scientists who were unaware of the fascist regimes in Europe, and their mission was to developed a new documented fission process in which the uranium-235 involved. They knew that they can be made a nuclear bomb instantly than Adolf Hitler made it. In the early stages, the project was funded by about $6000 from the United States Government, but the expenditures became increased day by day, which came up to $2 billion. At that time, the first test of the Nuclear Bomb tested with the success. After that 2 more bombs were destroyed in the same month, which the one in Nagasaki, Japan, and the other in Hiroshima. After that, World Warr II had been ended[3].

“His lectures were a great experience, for experimental as well as theoretical physicists,” commented the late physicist Hans Bethe (1906–2005), who would later work with Oppenheimer at Los Alamos. “In addition to a superb literary style, he brought to them a degree of sophistication in physics previously unknown in the United States. Here was a man who obviously understood all the deep secrets of quantum mechanics, and yet made it clear that the most important questions were unanswered. His earnestness and deep involvement gave his research students the same sense of challenge. He never gave his students the easy and superficial answers but trained them to appreciate and work on the deep problems.” [3]

At the point when Julius Oppenheimer passed on in 1937, Oppenheimer turned into a rich man. In 1940, he wedded Katharine (Kitty) Puening Harrison, a scientist and divorced person whose subsequent spouse had been murdered during the Spanish Civil War. The couple had two youngsters, Peter and Katherine. The venture included a few labs in mystery areas the nation over, including the University of Chicago; Oak Ridge, Tennessee; and Los Alamos, New Mexico. Oppenheimer administered the development of the Los Alamos research facility, where he accumulated the best personalities in material science to chip away at the issue of making a nuclear bomb. As a result of his initiative in this undertaking, he is frequently alluded to as the “father” of the nuclear bomb[3].

After World War II:

Oppenheimer came in October 1949 and the committee made him the General Advisory Committee of the Atomic Energy Commission. The Committee was against the hydrogen bomb. The opposition which was shocked by the idea of Oppenheimer so was suspended by the Atomic Energy Commission[3].

J. Robert Oppenheimer working out physics equations on the blackboard
J. Robert Oppenheimer working out physics equations on the blackboardJ. Robert Oppenheimer working out physics equations on the blackboard

In 1953, he was denied trusted status and lost his situation with the AEC. Entryways that had once been available to him were shut. “Oppenheimer took the result of the security hearing unobtrusively however he was a changed individual; quite a bit of his past soul and energy had left him,” reviewed Bethe. [3]

Oppenheimer’s anxiety for the overall population’s absence of logical comprehension, and the trouble of passing on the substance of logical revelations just as the elation of the innovative demonstration of disclosure to try and instructed laypeople, prompted a few famous articles on science. He conveyed the Reith Lectures on the BBC in 1953, and these were distributed under the title “Science and the Common Understanding[3].”

In April 1962, the U.S. Government offered some kind of reparation for the treatment Oppenheimer endured during the McCarthy years when President Kennedy welcomed him to a White House supper of Nobel Prize champs. In 1963, President John F. Kennedy declared Oppenheimer would get the Enrico Fermi Award. After Kennedy’s death, President Lyndon B. Johnson introduced the honor to him in December of that year. Oppenheimer was exposed to a security examination that turned into a reason célèbre and separated the scholarly and academic network[3].


Oppenheimer kept on supporting worldwide control of nuclear energy in his later years. He passed on of throat malignant growth on 18th February 1967, in Princeton, New Jersey. Today, he is regularly called the “father of the nuclear bomb. [3]”

Oppenheimer: The Man Behind the Bomb | A “Countdown to Zero” Exclusive | TakePart

Henry Moseley:

Small introduction:

Henry Moseley was a remarkably gifted exploratory physicist. In 1913 he utilized self-manufactured hardware to demonstrate that each component’s personality is remarkably dictated by the number of protons it has. His revelation uncovered the genuine premise of the intermittent table and empowered Moseley to foresee unhesitatingly the presence of four new substance components, which were all found[4].

Henry Moseley in the lab of Oxford University
Henry Moseley in the lab of Oxford University

Early Life and Education:

Henry Gwyn Jeffreys Moseley was conceived in the town of Weymouth, England, UK on 23rd November 1887. His folks were both from accomplished families. His dad, who was likewise named Henry, was a teacher of life structures and physiology. His mom, Amabel, was the little girl of a counselor who had changed professions to turn into a mollusk scholar[5].

Henry Moseley was taught in tuition-based schools. His first school was Summer Fields School – a grade school. There he won a grant for Eton College, which is presumably Britain’s most renowned secondary school. Sometime in the wake of showing up at Eton, he chose the school’s material science exercises were excessively simple, so he dealt with the subject autonomously. Matured 18, he won Eton’s material science and science prizes[5].

Effectively a high achiever, he was conceded in 1906 to the University of Oxford’s Trinity College, where he examined material science. There he frustrated himself. He was experiencing seriously hay fever when he sat his end of the year tests. He got a below-average distinctions degree in material science, not the ‘primary’ he had sought after and anticipated[5].

Ernest Rutherford’s Laboratory:

In 1910 Moseley moved to the University of Manchester to join Ernest Rutherford’s examination gathering. Rutherford had become world acclaimed two years sooner when he was granted the Nobel Prize in Chemistry for his disclosures in radioactivity. Even though Moseley’s degree was ‘one moment,’ Rutherford took him on after getting with teachers at Oxford that he was a promising physicist. Their characters were contrary energies. Rutherford was garrulous and noisy, while Moseley was fairly held, utilizing no greater number of words than he discovered vitally[5].

(Rutherford appears to have been a noisy character, so boisterous that partners, for example, Geoffrey Fellows poked fun at it.) [5]

Master of Missing Elements
Master of Missing Elements

At Manchester, Moseley instructed material science and completed examination work. He before long discovered that he didn’t appreciate the showing side of his work. After Moseley had been at Manchester for a year, Rutherford was adequately dazzled with his work that he offered him an examination association. Moseley acknowledged this cheerfully – it permitted him to focus all his consideration on exploration and drop his educating work[5].

Henry Moseley’s Scientific Discoveries

The Atomic Battery:

Working in Rutherford’s gathering, it was inescapable that Moseley would work with radioactive compound components. After getting comfortable with the field, he went past analyses others had thought of and concocted his specific wind. In 1912 he endeavored to utilize high sure voltages to pull beta particles (high energy electrons) back into their radioactive source. (This seems like a pleasant kind of thing at any rate, yet Moseley wanted to utilize the outcomes to reveal insight into one of the expectations of Albert Einstein’s extraordinary hypothesis of relativity: that mass increments with speed.) [5]

He attempted to pull the beta particles back by protecting their radioactive source (radium) so it would turn out to be progressively certain as the beta particles diverted negative charge[5].

Beta Emission:

If the radium could arrive at an electric capability of 1,000,000 volts, at that point even the most vivacious beta particles would be pulled once again into the source as they were discharged. Lamentably, the serious extent of flawlessness required in protecting the radium couldn’t be accomplished, so 1,000,000 volts couldn’t be reached[5].

Notwithstanding, by producing voltages (around 150,000 volts) on a radioactive source, Moseley made the world’s first nuclear battery – a beta cell. He considered it a radium battery. Today, nuclear batteries are utilized where long battery life is vital, for example, in heart pacemakers and rocket[5].

Explanation of the Periodic Table:

In the year 1913 Moseley celebrated his 26th Birthday. At that time Dmitri Mendeleev’s periodic table became older and it had been remained for about 44 years. After that new elements were found and added to the table. Subsequently, Mendeleev’s table was been used and the periodic table had decided to render to the atomic weights and the Chemical belongings[5].

There was, be that as it may, an essential defect in the table: the position anticipated by a component’s nuclear weight didn’t generally coordinate the position anticipated by its synthetic properties. In these cases, components were situated in the occasional table as per their properties, instead of their nuclear weight. Was it conceivable that components could have more principal property than nuclear weight[5]?

Antonius van cave Broek’s Hypothesis:

In 1911 Antonius van cave Broek had distributed his theory that nuclear number – which right now was just the situation of a component in the occasional table – may be equivalent to the measure of charge in the particle’s core. There was, in any case, no test proof to demonstrate this speculation[5].

Henry Moseley and a tale of seven elements
Henry Moseley and a tale of seven elements

Shooting Electrons at the Elements:

Moseley had gained from William and Lawrence Bragg that when high-energy electrons hit solids, for example, metals, the solids produce X-beams. This fascinated Moseley, who contemplated whether he could consider these X-beams to become familiar with what goes on inside iotas; he had van nook Broek’s speculation as a top priority explicitly[5].

He moved back to Oxford in 1913. Rutherford had offered him another cooperation at Manchester on better footing, however, Moseley chose the best way for his vocation is get involved with a few distinct research centers. There was no association open at Oxford, yet Moseley trusted one was coming up. He was given research center space, yet needed to self-reserve his work[5].

In an exceptionally limited quantity of time, he set up a test device to shoot high-energy electrons at various synthetic components and measure the frequency and frequencies of the subsequent X-beams. He found that every component discharges X-beams at an extraordinary recurrence. He additionally discovered he could get a straight-line chart by plotting the square-foundation of X-beam recurrence against components’ nuclear numbers[5].

His information appeared well and good if the positive charge in the nuclear core expanded by precisely one unit as you look starting with one component then onto the next in the intermittent table. As such, he found that a component’s nuclear number is indistinguishable from the number of protons it has[5].

Synthetic Elements = Proton Numbers:

This was immensely significant. It implied Moseley had found that the fundamental distinction between components is the number of protons they have. He understood that a component is characterized by its number of protons. If a component has one proton it must be hydrogen; two protons must be helium, three protons must be lithium, and so forth, and so on even though this may appear glaringly evident to us today, it was a gigantic disclosure in 1913[5].

At the point when Moseley organized the components in the intermittent table by their number of protons instead of their nuclear loads, the blemishes in the occasional table that had been making researchers awkward for quite a long time vanished[5].

Four New Chemical Elements:

Besides, much the same as Mendeleev had completed 44 years sooner, Moseley saw holes in his new occasional table. He anticipated the presence of four new components, with 43, 61, 72, and 75 protons. These components were found later by different researchers; we presently call them technetium, promethium, hafnium, and rhenium[5].

New Method of Identifying Elements:

As though his clarification of the intermittent table was insufficient, Moseley had additionally found another non-damaging strategy to discover which components are available in any example: you besiege the example with high-energy electrons and take a gander at the frequencies of the subsequent X-beams. These X-beams are tantamount to a unique mark for any components present in the example[5].

At that point, this was an especially welcome method for uncommon earth physicists, who had discovered their work getting practically horrible. The uncommon earth metals act so comparably that to investigate an example containing these components could take long periods of work. Moseley could now do it in minutes! [5]

150 years ago, the periodic table began with one chemist's vision
150 years ago, the periodic table began with one chemist’s vision

X-beam spectroscopy is currently utilized in research centers everywhere in the world. It is likewise used to examine different universes, for example, Mars[5].

Death and the last days:

In 1914 Rutherford and Bragg prescribed to the University of Oxford that Moseley ought to be selected to a seat of material science that was getting empty there. [5]

Moseley, notwithstanding, had different thoughts.

At the point when World War 1 started in 1914, he enrolled as a volunteer in the British Army’s Royal Engineers. His family begged him to proceed with his logical examination, and the military was hesitant to acknowledge him. Moseley needed to contend energetically to get into the military[5].

Second Lieutenant Henry Moseley was killed fighting at 27 years old in Gallipoli, Turkey on 10th August 1915. His grave is situated on Turkey’s Gallipoli Peninsula[5].


After his death, in the year 1916, he was not awarded the Nobel prize for his fruitful works in the field of physics and chemistry. There is a solid technical agreement that Henry Moseley, had been alive, would take conventional one of these awards[5].

Henry Moseley and the Periodic Table


The atom was invented by J. Robert Oppenheimer which was very explosive at that time. The main purpose of the atom bomb is to protect the country from the outer danger and not to use it for killing those humans which not involved in the criminal activity and not involved in the support of them. At that time, the atom bomb was used for killing those persons which were Innocent. In them, there are a lot of women, men, old age women and men, visitors, workers, and other human beings. The atomic number was discovered by Henry Moseley which was a great invention till today. The atomic number formation tells us the atomic mass, neutrons, protons, and the nucleus due to which we can say that it is Na (sodium), Li (lithium), or any other which is now being used in the periodic table. The periodic table is arranged in such a way that each number is placed in ascending order. In nowadays, these atoms are being used for the production of different things like making metals of different atoms and their atomic masses.  


1.            ias. 28th October 2020 Available from: https://www.ias.edu/oppenheimer-legacy

2.            wikipedia. 28th October 2020; Available from: https://en.wikipedia.org/wiki/J._Robert_Oppenheimer

3.            biography. 28th October 2020; Available from: https://www.biography.com/scientist/j-robert-oppenheimer

4.            en.wikipedia. 28th October 2020; Available from: https://en.wikipedia.org/wiki/Henry_Moseley#Scientific_work.

5.            famousscientists. 28th October 2020; Available from: https://www.famousscientists.org/henry-moseley/

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