Question

Which Isomer of hydrogen has one electron, one proton and no neutron?

• A. ${}_1^{1}H$.
• B. ${}_1^{2}H$.
• C. ${}_1^{3}H$.
• D. None

Answer 1

The correct option is A ${}_1^{1}H$.

in ${}_1^1\text{H}$ Atomic mass is $1$ and and atomic number(proton number) is $1$

$\therefore$ Atomic mass= Number of protons+ Number of neutrons

$1$ = $1$ + $0$

For a neutral atom number of the proton is equal to the number of electrons so number of proton will be equal to $1$.form this calculation number of neutron will be equal to $0$.

Hence, it ${}_1^{1}H$ has one electron, one proton, and no neutron.