Which of the following describes a planet?? Burning ball of gases that emits its own light
Large body of rock that revolves around the sun
Large, round body that revolves around a star
Round object that revolves around a moon

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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.