Q.

An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is–

A. 17
B. 19
C. 36
D. 53
Answer» B. 19
Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
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