What is true when a reaction has reached equilibrium?
a. the reaction has stopped.
b. the concentration of the products is changing.
c. the concentration the products and reactants is constant.
d. the concentration of the reactants is changing.

C. the concentration the products and reactants is constant.

i think it's c. i'm not sure but i think so.

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.