6 4 General
Characteristics
and Comparison
with Lanthanoids
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
5
5
5
5
5
6
6
6
6
7
7
Table 4 11: Oxidation States of Actinium and Actinoids
Rationalised 2023-24
113
The d- and f- Block Elements
The actinoids are highly reactive metals, especially when finely divided The action of boiling water on them, for example, gives a mixture of oxide
and hydride and combination with most non metals takes place at
moderate temperatures