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Mass Number and Representation of Atom

What is the m...

Question

What is the mass number of aluminium if it has 13 protons and 14 neutrons?

A

13

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B

14

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C

27

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D

28

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Solution

The correct option is C 27
Given that aluminium has 13 protons and 14 neutrons.
We know that,
Mass number = Number of protons + Number of neutrons
= 13 + 14 = 27.
$∴$ The mass number of aluminium is 27.

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