The Subatomic Particles of an Atom

  1. Atoms are made up of tiny particles called subatomic particles.
  2. An atom contains three types of subatomic particles: 
    1. proton, 
    2. neutron and 
    3. electron, 
  3. The proton and neutron form the nucleus at the centre of an atom. They are also called the nucleon of an atom.
  4. The electron moves around the nucleus at a very high speed.
  5. The nucleus is positively charged because of the presence of protons, which are positively charged. The neutrons are neutral.
  6. The symbols, charge and relative masses of proton, neutron and electron are as below.

Particle Symbol Relative charge Relative mass
Proton
p
+1
1
Neutron
n
0
1
Electron
e
-1
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