Which quantity or quantities must always be the same on both sides of a chemical equation?

Which quantity or quantities must always be the same on both
sides of a chemical equation? Check all that apply. Check all that
apply. the number of molecules of each kind the sum of the masses of all substances involved the number of moles of each kind of molecule the number of atoms of each kind

the sum of the masses of all substances involved
the number of atoms of each kind
During a course of reaction reactant molecules are react to give
new type of product molecules, so molecules cannot be same always
on both sides,
thereby the number of molecules of each kind and the number of
moles of each kind of molecule cannot be same on both sides of a
chemical reaction.
but the sum of the masses of all substances involved and the
number of atoms of each kind should be same on both sides, and it
cannot be different.

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