Chemistry (NTSE/Olympiad)  

4. Structure Of Atoms


In 1932, Chadwick discovered the fundamental particle neutron. The neutron is a neutral particle found in the nucleus of an atom. The subatomic particle not present in a hydrogen atom is neutron. A hydrogen atom contains only one proton and one electron. A neutron is represented by the symbol n.

Characteristics of a Neutron
Mass of a neutron : The mass of neutron is equal to the mass of a proton. The relative mass of a neutron is 1 u. The absolute mass of a neutron is 1.6 × 10–27 kg.
Charge of an neutron : Neutron has no charge. It is electrically neutral.
Comparision between Proton, Neutron and Electron:

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