Consider the intermediate chemical reactions.
ca(s)+ co2(g) + o2(g) → caco(s)
ah, = -812.8kj
ah, = -1,269.8 kj
2ca(s)+ o2(g) → 2cao(s)
the final overall chemical equation is cao(s) + co2(g) → caco3(s). when the enthalpy of this overall chemical equation is
calculated, the enthalpy of the second intermediate equation

is halved and has its sign changed.
is halved.
has its sign changed.
is unchanged.

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.