ATOMIC PHYSICS The nuclear atom All matter is made up of atoms which consist of a central nucleus‚ surrounded by electrons. Inside the nucleus are protons and neutrons. Particle Relative mass Charge Location Proton 1840 + Nucleus Neutron 1840 0 Nucleus Electron 1 - Outside nucleus Proton or atomic number (Z) This is the total number of protons in the nucleus of an atom. Nucleon or mass number (A) This is the total number of protons and neutrons in the nucleus of an atom. Note: a nucleon
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of six individuals that survived the atomic bomb of 1945. Without this book one could not truly determine if what we did to the Japanese was justified or not. We can also look at the way the journalism shapes our out look on things. This is why we always need to look at all the facts before we truly make up our mind on a subject. The book Hiroshima was a great story that was told through a third party perspective in order to explain the horrors of the atomic bomb. A few of the individuals duplicated
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Short Notes On Atomic Structure * Atom is the smallest particle of an element- All 117 elements has atoms * Bohr model: - Planetary model (see Figure 1 below) 1. Sun (proton & neutron= nucleus) 2. Planets (electrons) 3. Orbit (shell) Figure 1: Bohr model * Each type of atoms has a certain number of electrons and protons that differentiate it from the atoms of other elements Example: 1 proton 1 electron= Hydrogen (1 type elements) 2
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Atomic Theory-Study Sheet-Updated 9/15 *Reminder-Review Notes and this Question/Answer sheet DAILY to prepare for your next test. Goal: Grade of “A”. *Flash Review….Test October 7th How to use this study guide-Print the page and fold between questions and answers OR cover the answer column. Ask yourself the questions and see if you can correctly answer. Use it until you can answer ALL questions quickly with 100% accuracy. Do a little every day‚ and you will be ready for the next test
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∴ L for p electron = √1 ( 1 + 1 )h = √2h ∴ (A) Problem: For which of the following species‚ Bohr theory doesn’t apply (A) H (B) He+ (C) Li2+ (D) Na+ Solution: Bohr theory is not applicable to multi electron species ∴ (D) Problem: If the radius of 2nd Bohr orbit of hydrogen atom is r2. The radius of third Bohr orbit will be (A) 4/9r2 (B) 4r2 (C) 9/4r2
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alerted the US government to the possibility of an atomic bomb. President Roosevelt then set up a program to study uranium and the possibility of an atomic bomb. This started the series of events leading to the atomic bomb. American scientists‚ under this committee discovered that uranium-235(U-235)‚ the type used in the atomic bomb‚ is one part in one hundred and forty of normal uranium. Almost all of the initial work and studies into uranium and atomic bombs happened in New York‚ and as studies advanced
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proton and an electron? (1) They have the same masses and the same charges. (2) They have the same masses and different charges. (3) They have different masses and the same charges. (4) They have different masses and different charges. 3 The atomic mass of an element is the weighted average of the masses of (1) its two most abundant isotopes (3) all of its naturally occurring isotopes (2) its two least abundant isotopes (4) all of its radioactive isotopes 4 Which statement is true about
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Atomic structure: scientists 1. Democritus: 1st person to think of atom (500 BCE)- philosopher Atom is the smallest piece of an element that has same properties as the element. 2. Lavisier: Law of conservation of mass/ matter • Mass can’t be created or destroy; same amount of stuff 3. Joseph Proust: Law of constant composition (law of definite Proportions) • A compound is always made of the same elements in the same ratio. 4. John Dalton: English school teacher who derived the atomic theory
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Decision to Drop the Bomb By Jung Oh Introduction Of all the political and military decisions in history‚ few have 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
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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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