The most common charge (or valency) is -2. But there are compounds formed by elements of group VIA with valency from -2 to +6
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The charge of a group A nonmetal ion is determined by subtracting the group number from 8. For example, group 6A nonmetals would typically have a charge of 2- when they form ions.
The common ion charge of an element, Z, can be determined by looking at its position on the periodic table and its group number. Elements in the same group tend to have the same common ion charge due to their similar electron configurations. You can also refer to a periodic table to determine the common ion charge of element Z.
An ion is a particle that carries a charge, either positive or negative, due to losing or gaining electrons. It can be a single atom or a group of atoms that have an overall charge. A molecule is a group of atoms held together by chemical bonds and may or may not carry a charge.
A Polyatomic ion is a covalently bonded group of atoms that has a positive or negative charge and acts as a unit
A polyatomic ion is a group of atoms that behaves like a single ion. This group of atoms carries a charge and acts as a single unit in chemical reactions.