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Q.

What is the mass number of a Chlorine atom? 

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a

17

b

18

c

35

d

12

answer is C.

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Detailed Solution

Cl atom has 17 protons and 18 neutrons in its nucleus.  

Mass number (A) = The total number of nucleons, i.e., number of protons and neutrons in an atom 

A = 17 + 18 = 35 

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What is the mass number of a Chlorine atom?