the group 14 elements, also known as the carbon group and the group iv elements, is a group of elements on the periodic table. each element has 4 valence electrons. only carbon makes anions. silicon and germanium are semimetals. tin and lead are poor metals. ununquadium, a radioactive element, is not stable enough to see its properties. all of them can form +4 oxidation state compounds. tin and lead can form +2 compounds, too.