(a) List any two postulates of Bohr’s model of an atom.scribe by

(b) Draw a sketch of Bohr’s model of an atom with four shells

(c) name the three sub-atomic particles.

a. Two postulates of Bohr’s model of an atom are-

1. Electrons revolve rapidly around the nucleus in fixed circular paths called energy levels or shells.

2. Each shell can hold electrons up to some limits and each shell is associated with a fixed amount of energy.

b. Bohr’s model

c. The three sub-atomic particles are electrons, protons, and neutrons. Electrons are negatively charged, protons are positively charged, neutrons are neutral.