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Q.

An atom of an element ‘X’ has 7 protons and a mass number of 14 u. How many neutrons are present in the atom of ‘X’?

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a

7

b

14

c

21

d

6

answer is C.

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Detailed Solution

detailed_solution_thumbnail

The mass number of an atom is the sum of the number of all the protons and neutrons present in that atom.
Number of protons = 7 (given)
Thus, the number of neutrons = 14 − 7 = 7

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