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Chapter 5: Electrons In Atoms
Chapter 5: Electrons In Atoms

Medical Imaging - Computer Vision @ LEMS | Computer Vision
Medical Imaging - Computer Vision @ LEMS | Computer Vision

... up quark and 2 down quarks. The up quarks have an electrical charge of 2e/3, while the down quarks have an electrical charge of -e/3. All have spin quantum numbers of 1/2 or -1/2. This means that while the neutron is electrically neutral, it still has spinning charges within, and hence can have a no ...
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Chapter 4.1 and 4.2 - science-b

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Exam #2

... (a) Electron affinities decrease going down the group (from smaller to larger elements). (b) Ionization energies decrease going down the group (from smaller to larger elements). (c) Chemical reactivity decreases going down the group (from smaller to larger elements). (d) The second ionization energy ...
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... Mixture – a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained Nonmetal – is a chemical element that mostly lacks metallic attributes ...
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... Mixture – a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained Nonmetal – is a chemical element that mostly lacks metallic attributes ...
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PAP Chemistry - Fall Final Review

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... 3. Describe the difference between a heterogeneous and a homogeneous mixture and give two examples of each type. 4. Explain the difference between a pure substance and a mixture and give two examples of each. 5. Explain how the mass number and atomic number of an element can be used in determining t ...
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... o Electrons are low mass, negatively charged particles present within all atoms. Robert Millikan – Through the Oil Drop experiment, deduced that the mass of an electron was about 200 times lighter than a hydrogen atom. Ernest Rutherford – Through his gold foil experiment in which he shot  particles ...
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... 1. The orbitals are different from the Bohr orbits. 2. Probability maps indicate the likelihood of finding the electron at a given point in space. 3. The size of an atom can be described by a surface that contains 90% of the total electron probability. 11.4 Electron Configurations and Atomic Propert ...
Module 4: Nuclear Physics
Module 4: Nuclear Physics

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Atomic nucleus



The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.The diameter of the nucleus is in the range of 6985175000000000000♠1.75 fm (6985175000000000000♠1.75×10−15 m) for hydrogen (the diameter of a single proton) to about 6986150000000000000♠15 fm for the heaviest atoms, such as uranium. These dimensions are much smaller than the diameter of the atom itself (nucleus + electron cloud), by a factor of about 23,000 (uranium) to about 145,000 (hydrogen).The branch of physics concerned with the study and understanding of the atomic nucleus, including its composition and the forces which bind it together, is called nuclear physics.
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