Atom

• According to Bohr , an atom is composed by number of electrons moves in circular or elliptical orbits around the center nucleus. 
• The nucleus consists of protons and neutrons.
• Mass of electron = 9.1 × 10 ^{– 31} kg
• Charge of electron = 1.6 × 10 ^{– 19} coulomb
• Diameter of atom = 10 ^{– 10} meter
• Diameter of nucleus = 10 ^{– 15} meter

Atomic number

• It is defined as the number of proton in the atom.

Atomic Mass number

• It is defined as the sum of number of protons and number of electrons.

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