Question

no. of neutron in one atom

Answer 1

there is only one neutron in one atom

Answer 2

↑ Here is your answer ↓
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The no. of neutrons in an atom depends upon the element. i.e. different elements have different number of electrons.

Here are some examples:

Hydrogen - 0

Helium - 2

Lithium - 4

Beryllium - 9

Boron - 6