An atom of silicon has a mass number of $29$ . How many neutrons does it have?

14

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15

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16

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28

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29

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Solution

The correct option is B $15$
The mass number includes the atomic number (= the number of protons) and the numbers of neutrons:
A = mass number = the number of nucleons = $29$
Z = atomic number = the number of protons = $14$
A - Z = the number of neutrons = $29 - 14$
$= 15$

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