A) What are the postulates of Bohr's model of an atom??
(b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

a) As I remember "the atomic spectra" of bohr

1- Existence of a positively charged nuclei in the centre of the atom

2- Number of negatively charged electrons = number of positive charges ported by the atom.

3- Electrons navigate in fixed energy levels , with a high speed without gain or loose energy

4- centrifugal force is in equilibrium with attraction force.

5- The empty space between energy levels is forbidden for electrons.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).