Answer:
Alkali and alkaline-earth cations are energetically stable with an empty valence shell. Atoms of alkali and alkaline-earth elements achieve octets after losing one (alkali) or two (alkaline-earth) electrons such that they minimize the potential energy of the system.
Water is a pure substance because it is not refined like the other materials. Hope this helps!!!
the room will either cool down or warm up the water until it is the same temperature as the room around it.
