# Atom of an element has Z electrons and its atomic mass is 2Z + 3. The number of neutrons in its nucleus will be

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Atom of an element has Z electrons and its atomic mass is 2Z + 3. The number of neutrons in its nucleus will be

a. 2Z

b. Z + 3

c. Z + 2

d. Z

+1 vote
by (58.3k points)

Correct option is b. Z + 3

by (50.0k points)

Correct option is (b) Z + 3.

For a neutral atom -

Number of electrons = Number of protons

and mass Number = Number of electrons + Number of neutrons.

$\therefore$ Number of protons = Z

$\therefore$ Number of Neutrons = (2Z + 3) - Z

= Z + 3.