Which elements would be the equivalent of the noble gases? Express your answers as chemical symbols. Enter your answers in order of increasing atomic number separated by commas.

level 4 to level 2 : ))

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.