What happens when two atoms of potassium react with one atom of sulphur?

Bonding between this compound will be ionic as potassium is a metal and sulphur is a non-metal.Therefore electrons are transferred from potassium to sulphur as metals must lose electrons to gain a full outer shell. Two potassium atoms each lose one electron, as each atom only has one electron to lose in its outer shell.This forms K+ ions, each with a 1+ charge.One sulphur atom can gain 2 electrons.This therefore form one S2-, with a 2- charge.