Which occurs during summer in the northern hemisphere? a. the earth is closer to the sun. b. the earth's axis is tilted so that the northern hemisphere faces the sun. c. the earth's axis is tilted so that the northern hemisphere faces away from the sun. d. the earth is farther away from the sun.

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.