Which group in the periodic table would have an an ion of a -2 charge?

Group 6

Explanation:

There are eight (8) groups in the periodic table. Elements in Group 6 include OXYGEN, SULPHUR etc.

These elements have an outermost shell with 6 electrons; thus, they are always ready to RECEIVE two electrons from possible donors to form a completely filled outermost shell.

For example

Oxygen has atomic number of 8, its configuration is 2, 6

Sulphur, has atomic number of 16, its configuration is 2, 8, 6

Each require TWO electrons to attain stable octet structure, so, will accept two electrons and become an ANION with -2 charge

O2 + 2e- ---> 2O-

S2 + 2e- ---> 2S-