When relative humidity is at 100 percent, air is said to be what?

Fully saturated or "a chance of rain"

Explanation:

When relative humidity reaches 100%, the air is fully saturated with vapor. That means that there is a possibility of rain.

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.