2.2 ATOMIC STRUCTURE

1. Atom

1.1. the smallest indivisible particle of matter

1.2. Atomic radii are of the order of 10-8cm

1.3. contain three subatomic particles namely electrons, protons and neutrons

2. Electron

2.1. It carries a unit negative charge

2.2. mass of one mole of electron is 0.55 mg.

3. Proton

3.1. It carries a unit positive charge

3.2. The mass of proton is 1.007276 U

4. Neutron

4.1. Neutrons are neutral particles

4.2. he mass of neutron is 1.675x 10-24 g or 1.008665 amu or u.