What do u mean by change in state of matter?define it.
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The mode of changing from one state of matter into another state and back to the former or original state is called change in state of matter .

hope it is helpful to you

change in one state from another and back in its own original is known as change in state of matter

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).

b) nuclear ive learned that in a pedtrodic table