when 25.215g of a mixture of substances X, Y and Z was separated, 7.52g of X and 8.48g of Y was recovered. assuming that there was no loss of components during the separation process, calculate the percentage by mass of Z in the mixture.​

the answers would be

the first one and the second one

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.