If an element has atomic number 2 and mass number 4, what will be the number of neutrons present in the element?

Q. If an element has atomic number 2 and mass number 4, what will be the number of neutrons present in the element?

A

2

B

4

C

6

D

None of the above

Solution:

Number of neutrons=A-Z.
A=4,Z=2
4-2=2.

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