does any one know how to do this

The trick to all of these questions is knowing that if you GAIN electrons, the atom becomes negative and if you LOSE electrons the atom becomes positive.Electrons have a negative charge.Another bit of knowledge you should know is the more electrons an atom has, the larger an atom is.Finally, anions (atoms with a positive charge) are almost all metals and actions (atoms with a negative charge) are almost all non-metals.