You can predict the negative charge on an anion by looking at the group number for the atom. The charge for representative elements is typically equal to the group number minus eight. The symbol is F 1- with the charge written as a superscript. The symbol is O 2- with the charge written as a superscript. The charge on a monoatomic cation depends on the group for the atom.
Metallic elements have weaker attractions for electrons than the nonmetals.
Atoms of metals can be stripped of electrons to form cations. You can predict the positive charge on cations using the group number for representative elements. The charge is written after the symbol as a superscript. All rights reserved.