Halogens always form anions, alkali metals and alkaline earth metals always form cations. Most other metals form cations (e.g. iron, silver, nickel), whilst most other nonmetals typically form anions (e.g. oxygen, carbon, sulfur).

Are metals anions or cation?

Alkali metals and alkaline earth metals always form cations. Halogens always form anions. Most other nonmetals typically form anions (e.g. oxygen, nitrogen, sulfur), while most metals form cations (e.g. iron, gold, mercury).

Why are all metals cations?

Metal elements form positively charged ions called cations because they are located on the left side of the periodic table. ... These elements all have valence electrons in an s orbital. These electrons are relatively easy for the atom to lose to achieve a stable octet of electrons in its outermost energy shell.