Hydrogen (in it's metal state), Lithium, Sodium, Potassium, Rubidium, Cesium, Francium, Beryllium, Magnesium, Calcium, Strontium, Barium, Radium, Aluminum, Gallium, Indium, Tin, Thallium, Lead Bismuth. Those are all I know but I'm pretty positive there are more.
