Write the structure of a chalcogenide dianion.

Explanation

To write the structure of a chalcogenide dianion, we first need to identify the relevant elements in the chalcogen group (Group 16 of the periodic table). The chalcogens include oxygen (O), sulfur (S), selenium (Se), and tellurium (Te).

1. **Identify the Chalcogen Elements**: The chalcogen group consists of four main elements: oxygen, sulfur, selenium, and tellurium. Each of these elements can form a dianion by gaining two electrons.

2. **Determine the Dianion Forms**: The dianions for these elements are:
- Oxygen forms the oxide ion (O²⁻).
- Sulfur forms the sulfide ion (S²⁻).
- Selenium forms the selenide ion (Se²⁻).
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