Question

Helium atom has atomic mass for energy and two protons in its nucleus how many neutrons does it have

Answer 1

Ans is 2 ... because the atomic mass of He is 4 and atomic number is 2 . So there fore number of neutrons= atomic mass - number of protons

Answer 2

☆$\red {HELLO\:DEAR}$☆

Helium atom has two neutrons.

The mass of an atom is the sum of the masses of protons and neutrons present in its nucleus.

Since helium atom has two protons, mass contributed by the two protons is (2 × 1) u = 2 u.

Then, the remaining mass (4 − 2) u = 2 u is contributed by 2u/1u = 2 neutrons.

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