06/04/2021

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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