Why did mendeleev improve newlands periodic table

Mendeleev improve newlands periodic table because he  swapped the order of some elements if that fitted their properties better.

Explanation: I hope this helps!... :)

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).