What are the quantum numbers of the fifth electron of Na

The last electron is in third shell, so Principal quantum number will be 3 .

The azimuthal quantum no. Can be 0,1,2, but as it is the first electron in last shell so the second quantum no. Will be 0 .

Since the second quantum no. is 0, so the magnetic quantum no. will also be 0.

The spin quantum no. will be +1/2, by hund's rule.

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).