GraceCoutts By 4721 Aug 1, 1732 Cobalt Aug 1, 1735 Platinum Aug 1, 1751 Nickel Aug 1, 1755 Magnesium Aug 1, 1766 Hydrogen Aug 1, 1770 Magnese Aug 1, 1771 Oxygen Aug 1, 1772 Nitrogen Aug 1, 1774 Chlorine Aug 1, 1808 Barium
