Isotopes‚ sub-atomic particles and relative atomic mass Sub-atomic particles A subatomic particle is a particle smaller than an atom: it may be elementary or composite. In 1905‚ Albert Einstein demonstrated the physical reality of the photons‚ hypothesized by Max Planck in 1900‚ in order to solve the problem of black body radiation in thermodynamics. In 1874‚ G. Johnstone Stoney postulated a minimum unit of electrical charge‚ for which he suggested the name electron in 1891. In 1897‚ J. J. Thomson confirmed
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The Atomic Model has changed over time‚ as the years‚ decades‚ and centuries go by we get a better understanding of the atom and what it looks like. The Atomic Model has changed drastically based on the understanding we have on it‚ each new model has added more information to what we know about it‚ making it easier for scientists and the world to understand. The Atomic Model is a very important part of Science and Chemistry‚ it helps explain the structure and what is inside the atom‚ the particle
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1. Atomic and Molecular Structure a. Students know how to relate the position of an element in the periodic table to its atomic number and atomic mass. The Periodic Table organizes elements by their atomic number - from hydrogen (1) to whatever is the highest one currently known (>105). It is arranged so that similiar members fall in a list such as Chlorine Bromine etc.. The average atomic weight is usually shown with each element‚ but due to isotopes (caused buy nuclear varations)
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This investigation will explore the question: To what extent was President Truman’s decision to the drop atomic bomb to save lives and hasten the end of World War Two? The pressures and outcomes of dropping the explosive on Hiroshima and Nagasaki in 1945‚ will be the focus of this investigation. The first source is Thomas Holmes article‚ “The Dropping of the Atomic Bombs on Japan”‚ published in 2005 in the United States. The origin is valuable because Holmes is an American historian and social studies
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been subject to more analysis and comment than the atomic bombings of Hiroshima and Nagasaki (Miles‚ 1985‚121). Scholars in the field have grappled with the vexing question of why the United States decided to use the atomic bomb near the conclusion of the Second World War. A careful study of the critical events leading up to 6 August 1945 offers many distinct explanations. Contemporary discussions on the subject matter introduce a host of theories but taken individually they are far from satisfying
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creation of one of the most destructive weapons known to humanity occurred within the United States. This weapon‚ known as “the atomic bomb‚” was used on the two Japanese cities: Hiroshima and Nagasaki‚ resulting in a death toll unprecedented by any military weapon used before and an immediate‚ unconditional surrender. Some historians believe President Truman decided to drop the atomic bomb in order to intimidate the Soviet Union whereas others believe it was a strictly military measure designed to force
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The development of the atomic bomb and chemical warfare forever changed the way people saw the world. It was a landmark in time for which there was no turning back. The constant balancing of the nuclear super powers kept the whole of humankind on the brink of atomic Armageddon. Fear of nuclear winter and the uncertainty of radiation created its own form of a cultural epidemic in the United States. During these tense times in human history officials made controversial decisions such as the bombings
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United States dropping on atomic bomb on Hiroshima was one of the most controversial topics of 1945. Many believe that the United States decision to drop this atomic bomb on Hiroshima‚ was a diplomatic measure intended to scare the Soviet Union after the Second World War; however‚ this is untrue. The United States decision to drop the atomic bomb on Hiroshima was done entirely to scare the Japanese army‚ and force them to surrender. The United States choice to drop the atomic bomb‚ strictly for the
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the atomic bombs. By doing this‚ there would be many benefits‚ but also some very harsh consequences. The atomic bombs were necessary to end the war because they allowed the US shut things down quickly‚ they assisted the US with showing it’s power‚ and it helped get justice for the soldiers that have already lost their lives fighting for their country. The main reason the US felt the need to drop the atomic bomb was because it was crucial for them to end this war once and for all. The atomic bombs
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Was the Atomic Bombing Justified? The Atomic Bomb made a very serious statement at a time when the world was in disarray (“Manhattan”). World War II was one of the most destructive times in history causing over 50 million deaths and leaving behind mental and physical casualties of war. (“World War II”) It started in September‚ 1939 when Germany invaded Poland and continued on a destructive path through Europe. Britain and France declared war on Germany. Two years prior in 1937‚ the Sino Japanese
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