What caused the population to increase during the Warring States period? Conquered peoples were resettled in the empire.
Better tools were used to increase the food supply.
Soldiers were hired from outside the empire for protection.
Cultural development convinced people to remain on their lands.

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.