Question

Which subatomic particle is absent in an ordinary hydrogen atom​

Answer 1

Answer:

Neutron is neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.

Answer 2

Answer:

$The \:  subatomic \: particle \: \\  that \: is \:  not \: present \:  in \\ an \: ordinary \:  hydrogen \: \\ atom  \: is \: neutron$