SUBATOMIC PARTICLES

An atom is made up;

• PROTON
• NEUTRON
• ELECTRON

PROTON (+ve chanrge) and NEUTRON (no charge) are located in the nucleus, while ELECTRON (-ve charge) are move rapidly around the nucleus of an atom.

PROTON NUMBER (Z)

• Also known as atomic number
• Is number of protons in the nucleus of each atom.
• In neutral atom,
• number of protons = number of electrons

NUCLEON NUMBER (A)

• Also known as mass number
• Is a a total number of protons and neutrons present in the nucleus of an atom
• Nucleon Number = Number of protons + Number of neutrons

ISOTOPES

• Are atoms of the same element, having the same number of protons in their nucleus but different number of neutrons.