Question

Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have​

Answer 1

Answer:

2 neutrons

Explanation:

The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass. Hence, it must contain 2 neutrons.

HOPE IT HELPED

∆∆∆∆∆∆∆∆∆∆∆∆∆

Answer 2

Answer:

2 neutrons

Explanation:

2 neutrons

The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus. Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass. Hence, it must contain 2 neutrons.