When are elements unreactive

element are less reactive if they are in the group 18 8A but of the element are before 18 they are more reactive the one that is most reactive is group 1 1A if this is not what your looking for im sorry

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products