Group 3 element
From Academic Kids
- scandium (21)
- yttrium (39)
All of these elements are classed in Group 3 because their outer shell holds three electrons. Scandium, yttrium, and the lanthanides (except promethium) can all be found naturally, albeit at very low levels in the Earth's crust, and are collectively called rare-earth metals. Promethium (61) and neptunium (93) through lawrencium can only be produced in the laboratory and have 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.