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10 October, 07:11

How many subatomic particles would a neutal atom have if its atomic number was 23 and its mass number was 57?

a) 80 neutrons, 23 protons, 34 electrons

b) 57 neutrons, 23 protons, and 23 electrons

c) 23 neutrons, 57 protons and 57 electrons

d) 34 neutrons, 23 protons and 34 electrons

e) 34 neutrons 23 protons and 23 elecrrlns

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Answers (1)
  1. 10 October, 08:10
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    e) 34 neutrons 23 protons and 23 electrons

    Explanation:

    Atomic number = number of electrons = number of protons

    So the atom contains 23 protons and 23 electrons

    To find the number of neutrons we make use of the formula

    Mass number - atomic number = number of neutrons

    So 57 - 23 = 34 neutrons

    Atom contains 23 protons, 23 electrons and 34 neutrons

    Option e is the answer.
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