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28 December, 07:42

An atom is made of 16 protons, 17 neutrons, and 18 electrons. What is the mass number of

this atom?

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  1. 28 December, 07:53
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    The answer is 33.

    Explanation:

    The mass number of an atom is the atomic mass which consists of proton and neutron. This atom has 16 protons and 17 neutrons so it has a mass of 33:

    proton number + neutron number = nucleon number / atomic mass

    16 + 17 = 33
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