Question

helium atom has an atomic mass of 4u and two proton into nucleus. how many neutron does it have

Answer 1

Atomic mass = Number of protons + Number of neutrons.

Given Atomic mass = 4u.
Number of protons = 2

Number of neutrons = Atomic mass - Number of protons = 4 - 2 = 2 .

Answer 2

Hlo friend.. Cutiepie Here..

Here is ur answer :

Atomic Mass of Helium = 4u

No. Of protons = 2

No. Of neutrons =?


Let the no. Of neutrons be n.

Atomic mass = No. of protons + No. Of neutrons

4 = 2 + n

n = 4 - 2

n = 2

No. Of neutrons = 2

HOPE IT HELPS YOU..

REGARDS
@sunita