The element that is able to form a divalent negative ion in the list is selenium. Option A
What element forms the ion?
We know that an ion can be formed when there is the loss or gain of electrons from an atom. When electrons are lost from atom what we have is a positive ion and when electrons are gained in an atom what we have is a negative ion.
The magnitude of the charge on the ion would have to do with the number of the electrons that have been lost or gained by the atom that we are looking at.
We know that a divalent negative ion can be formed by the atoms that belong to group sixteen of the periodic table hence we look out for the members of that group and a typical example of that is selenium. This element is one of the elements found in group sixteen.
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