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Structure of th...

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  • Question 1
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    The number of electrons in a neon atom is

  • Question 2
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    Use the following information to answer the next question.

    In Rutherford's experiment, atoms in a gold foil were bombarded with α-rays. Rutherford observed that most of the rays passed through the foil and a few were diverted or completely bounced back.

    The part of atomic theory that came into light using Rutherford's experiment is a good scientific theory because

  • Question 3
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    If a neutral atom of aluminium (Al) contains 13 electrons, 13 protons, and 14 neutrons, then the atomic number of the aluminium atom is

  • Question 4
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    Which of the following statements is not a postulate of Rutherford’s nuclear model of an atom?

  • Question 5
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    Use the following information to answer the next question.

    Chromium, which is a lustrous, steel gray and hard metal, has a high melting point. It exists in nature in the form of four isotopes, chromium-50, chromium-52, chromium-53, and chromium-54. The respective relative abundances of these isotopes are 4.35 %, 83.79 %, 9.5 %, and 2.36 %.

    The average atomic mass of chromium is

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