$A$ metal $M$ has the electronic configuration $M: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$. To which block does this metal belong?

Which of the following options correctly represents the increasing order of the paramagnetic property of the ions?

Which of the following elements is $NOT$ regarded as a transition element?

Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are:
$I$. They have high melting points,higher than those of pure metals.
$II$. They are very hard.
$III$. They retain metallic conductivity.
$IV$. They are chemically more reactive than the pure metals.

Discuss the magnetic properties of transition elements.

The yellow colour of chromate ion and orange colour of dichromate ion is due to