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Introduction to Atomic Structure

An element ha...

Question

An element have atomic number 19 and mass number 39. The number of neutron in its nucleus is-

A

20

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B

58

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C

19

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D

39

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Solution

The correct option is A 20
No. of Neutrons = Mass No. - Atomic No
= $39$ - $19$
= $20$

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