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Mass Number and Representation of Atom

The particle ...

Question

The particle not present in an ordinary hydrogen atom is :
(a) proton

(b) neutron

(c) nucleus

(d) electron

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Solution

(b) neutron
A hydrogen atom ${}_{1}^{1}H$ has 1 proton and 1 electron, but it does not have any neutron.

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Mass Number and Representation of Atom

Standard IX Chemistry

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