Group 4 element

Group	4
Period
4	22 Ti
5	40 Zr
6	72 Hf
7	104 Rf

(La)	58 Ce
(Ac)	90 Th

A Group 4 element is an element in periodic table group 4 (IUPAC style) in the periodic table, which consists of:

titanium (22)
zirconium (40)
hafnium (72)
rutherfordium (104)
cerium (lanthanide) (58)
thorium (actinide) (90)

All of these elements are classed in Group 4 because their valence shell holds four electrons. Rutherfordium can only be produced in the laboratory and has not been found in nature.

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.