Which of the following is ferromagnetic in nature?

State the reason for the stability of the $Gd^{3+}$ ion.

The aqueous solutions of the following salts will be coloured in the case of:

The atomic number of $Pd$ is $46$. The atomic numbers of the elements lying immediately above and below it in the same group are,respectively,.....................

Identify the incorrect statement among the following:

In the electronic configuration of which of the following elements is an electron arranged in the $5d$ orbital?