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Atomic Number

The mass of o...

Question

The mass of one helium atom is:

2

amu

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3

amu

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4

amu

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8

amu

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Solution

The correct option is C $4$ amu
The mass of 1 atom is defined in amu units.
amu = atomic mass unit
In helium atom,
number of proton = 2
number of neutron = 2
Atomic mass = number of proton + number of neutron
so, mass of 1 helium atom becomes 4 amu.
Hence option C is correct.

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