The principal oxidation states are \(+3\) and \(+4\). The \(+3\) oxidation state is the most stable. The \(+4\) oxidation state is the most stable in Th and Pu. \(+5\) in \(Pa\) and \(Np\) and \(+6\) is seen in U. In actinides, the distributions of oxidation states are uneven.
(પરમાણ્વીય ક્રમાંક: $Ni = 28, Ti = 22, $$Cr = 24, Co = 27$)