If there is no subscript on an element symbol there is/are atom(s) of that element.

If there is no subscript written after a symbol that means there is one atom of that element present

Explanation:

correct me if I'm

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).