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22 May, 03:21

Zinc has the chemical symbol Zn and the atomic number 30. How many protons, neutrons, and electrons does an atom of zinc-69 have?

A. 30 protons, 39, neutrons, 39 neutrons

B. 39 protons, 30 neutrons, 30 neutrons

C. 39 protons, 30 neutrons, 39 electrons

D. 30 protons, 39, neutrons, 30 electrons

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Answers (2)
  1. 22 May, 03:23
    0
    D. 30 protons, 39 neutrons, 30 electrons

    Explanation:

    The atomic number (Z) is the number of protons (p) in the nucleus. Since

    Z = 30, p = 30.

    In a neutral atom, the number of electrons (e) equals the number of protons. Since p = 30, e = 30.

    The mass number (A) is the number of protons plus the number of neutrons (n).

    A = p + n

    For an atom of zinc-69,

    69 = 30 + n Subtract 30 from each side and transpose

    n = 39
  2. 22 May, 03:51
    0
    D, because isotopes all have the same atomic number but different number of neutrons
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