Q72 / 270 · NDA 2016 (Phase 1) · General Ability

An atom of carbon has 6 protons. Its mass number is 12 . How many neutrons are present in an atom of carbon?

A
12
Correct answer
B
6
C
10
D
14

Solution

Mass number $=$ number of proton + number of neutron $12=6+$ number of neutron $12-6=$ number of neutron number of neutron $=6$

Hence, the correct answer is option: 'B'.

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