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4 February, 17:14

What is the mass number of an oxygen atom with nine neutrons in its nucleus? (a) 8 (b) 9 (c) 17 (d) 16 (e) 18

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  1. 4 February, 17:43
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    Answer: mass number of oxygen is 17.

    Explanation:

    Atomic number is defined as the number of protons or number of electrons that are present in an atom.

    Atomic number = Number of electrons = Number of protons = 8

    Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

    Mass number = Number of protons + Number of neutrons = 8 + 9 = 17

    Hence, mass number of oxygen is 17.
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