Answer:
Copper turns green on exposure to air
Explanation:
Liquid water freezes to form ice: Physical change
Reason: Water can melt back when it becomes ice.
Copper turns green on exposure to air: Chemical change
Reason: The copper can not change back from the green state when it turns green.
Na because its a metal. Metals are the best conductors. S and Ne are nonmetals. and Ge is a metalloid. (Metalloids are semi conductors)
Static Friction, Sliding Friction, Rolling Friction, and finally Fluid Friction.
The answer is CONDENSATION.
Answer:
5 valence electrons
Nitrogen has a total of 5 valence electrons
Explanation: