Which group has a charge of -2?

The correct choice indicates that Group VIA elements typically possess a charge of -2, particularly when they form anions. This group includes elements such as oxygen and sulfur, which commonly gain two electrons to achieve a stable electronic configuration similar to noble gases. As a result, they often exhibit a -2 oxidation state in their ionic forms, which is significant in various chemical reactions and compounds.

This -2 charge is crucial for understanding the bonding and reactivity of these elements in both organic and inorganic chemistry. For example, when oxygen forms oxide ions, it takes on this -2 charge, which is foundational in processes like combustion and cellular respiration.

In contrast, the other groups listed do not typically form -2 charged ions. Group VIIB (the halogens) tend to gain one electron and have a charge of -1, Group VIB elements tend to exhibit various charges depending on the specific element and its oxidation state, and Group IB primarily consists of metals that typically lose one electron, generally resulting in a +1 charge. Thus, Group VIA stands out as the group with a consistent tendency to form -2 charged ions.