A Group 7 element is an element in periodic table group 7 (IUPAC style) in the periodic table, which consists of:
All of these elements are classed in Group 7 because their valence shell holds four electrons. Technetium has no stable isotopes. Technetium, and promethium (61), are the only two such elements before polonium, after which no known element has a stable isotope.
Color coding for these atomic numbers: At room temperature, all are solid; red indicates item is synthetic and does not occur naturally.
