The mass of one helium atom is (A) 2 amu (B) 3 amu (C) 4 amu (D) 8 amu

Helium gas is a non-toxic and non-combustible gas that is obtained from natural gas. Helium Gas was first detected in sun. It is available abundantly and is the second lightest gas seen. In helium atom,

number of proton = 2

number of neutron = 2

Atomic mass = number of proton + number of neutron

Hence, mass of 1 helium atom becomes 4 amu

Therefore, the correct option is (C)

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