The coinage metals are

Assertion : Transition metals show variable valency.
Reason : Transition metals have a large energy difference between the $ns^2$ and $(n-1)d$ electrons.

Which among the following elements is a soft element as compared to others?

The correct order of ionisation energy is:

Four successive members of the first series of the transition metals are listed below. For which one of them is the standard electrode potential $(E^o_{M^{2+}/M})$ value positive?

The valence shell electronic configuration of $Cr$ and $Cu$ atoms, respectively, are