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Q.

The atom without neutron is

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a

H

b

He

c

Na

d

C

answer is A.

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Detailed Solution

Hydrogen have the $1 s^{1}$ electronic configuration.

Hydrogen in it’s nucleus have the only proton & 1e- in it’s 1s orbital.

There is no neurons in it’s nucleus. Hydrogen atomic weight is 1.008 amu.

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The atom without neutron is