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Structure of the Atoms Test - 11

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Structure of the Atoms Test - 11
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  • Question 1
    1 / -0

    The number of electrons in a neon atom is

    Solution

    Number of electrons = Number of protons = Atomic number

    Hence, the number of electrons in a neon atom is 10.

    The correct answer is A.

  • Question 2
    1 / -0

    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

    Solution

    A theory can be called a good scientific theory, if the theory is testable and can be repeated by anyone to obtain the same results. Rutherford's experiment can be repeated anytime (and by anyone) to yield the same results. Hence, the atomic theory based on Rutherford's experiment can be classified as a good scientific theory.

    The correct answer is B.

  • Question 3
    1 / -0

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

    Solution

    The number of protons present in the nucleus of an atom is called the atomic number of that element.

    It is given that the number of protons in a neutral atom of aluminium is 13. Therefore, the atomic number of the aluminium atom is 13.

    The correct answer is A.

  • Question 4
    1 / -0

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

    Solution

    The magnitude of charge on the nucleus is different for atoms of different elements.

    The correct answer is B.

    Why alternatives A, C and D are wrong:

    The statements given in alternatives A, C, and D are the postulates of Rutherford’s nuclear model of an atom. Hence, these alternatives are incorrect.

  • Question 5
    1 / -0

    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

    Solution

    Average atomic mass of chromium = {(50 × 4.35) + (52 × 83.79) + (9.50 × 53) + (2.36 × 54)}/100 = (217.5 + 4 357.08 + 503.5 + 127.44)/100

    5 205.52/100 = 52.06

    The correct answer is A.

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