Group 7 element

Group	7
Period
4	25 Mn
5	43 Tc
6	75 Re
7	107 Bh
(La)	61 Pm
(Ac)	93 Np

A Group 7 element is an element in periodic table group 7 (IUPAC style) in the periodic table, which consists of:

• manganese (25)
• technetium (43)
• rhenium (75)
• bohrium (107)
• promethium (lanthanide) (61)
• neptunium (actinide) (93)

All of these elements are classed in Group 7 because their valence shell holds four electrons. Neither Technetium nor Promethium have any stable isotopes. These are the only two elements before polonium, after which no known element has a stable isotope.

Key to color coding in table slice on right:

Transition metals

Lanthanide Series

Actinides Series

Color coding for these atomic numbers: At room temperature, all are solid; red indicates item is synthetic and does not occur naturally.