Use the group number to determine the charge on an ion derived from each element.

Question

Rubidium,
Aluminum,
Phosphorus,

Bromine:

Answer 1

Rubidium (Rb) belongs to group 1 which means it will have a charge of +1 on its ion.

Aluminum (Al) belongs to group 3 which means it will have a charge of +3 on its ion.

Phosphorus (P) belongs to group 15 which means it will have a charge of -3 on its ion.

Bromine (Br) belongs to group 17 which means it will have a charge of -1 on its ion.