Question

The fundamental particle not present in a hydrogen atom is _____.

Answer 1

Subatomic particles:
The small particles inside an atom are subatomic particles or fundamental particles.
There are three types of subatomic particles:
1. Electrons: Electrons are negatively charged.
2. Protons: Protons are positively charged.
3. Neutrons: Neutrons have no charge.
Subatomic particles in hydrogen atom:
1. Hydrogen atom contains two types of subatomic particles, i.e., one proton and one electron.
2. No neutron is present in the hydrogen atom.
3. Thus, the subatomic particle absent in the hydrogen atom is a neutron.

Hence, the fundamental particle not present in a hydrogen atom is a neutron.