Common oxidation state of f-block elements is III. The other stable oxidation state of `.^63Eu` and `.^65Tb` are respectively

Options

A. II,IV
B. IV,II
C. II,V
D. V,II

Answer

A

Explanation

Common oxidation state of f-block elements is III `.^63Eu`
contains `4f^7` electrons in 4f subshell.
Hence, the oxidation state is 2
`.^65T_6` contains `4f^9` electrons in 4f-subshell.
Hence, the oxidation state is 4.