Exothermic is a chemical reaction in which heat is released. Lighting a candle is an example of an exothermic because the flame is the heat being released.
Francium oxide Fr₂O
Francium, as well as sodium, is in 1A group. Its valency is equal to unit.
I think it’s B not quite sure ! Sorry
Answer: Weather currents change wind tempature and there for change the weather of the seasons.
