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Question

The atomic number of aluminium (Al) is 13, and its mass number is 27. The total number of neutrons in an Al atom is.

A
15
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B
13
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C
14
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Solution

The correct option is C 14
Given:
Atomic number of aluminium, Z = 13
Mass number of aluminium, A = 27
Number of neutrons in aluminium = (A - Z) = 27 - 13 = 14.

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