Substance is held in an open container. Its particles move past one another at random speeds but do not leave the container. Heat is removed from the system, and the particles slow down. When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. When this happens, the substance enters its solid-state.

where is the following

explanation:

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.