Any help on Voltaic Cells?

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

What is the effect of returning nuclear reactor cooling water back into bodies of water?

The diagin dilutepage 6 of 12a6a5(a)fluorine, chlorine, bromine and iodine are placed in the same group of theperiodic table. state the common name used to describe elements in this group.(i)state the group in which the elements are placed and explain whythey are placed in that group.(ii)which of the above named elements is a solid at roomtemperature and pressure?