Given reasons for the following features of transition meatal chemistry : (i) The lowest oxide of a transition metal ( say, chromium , atomicnumber 24 ) is basic whereas the highest oxide is usualy acidic. (ii) Transition metals sometimes exhibit very low oxidation states such as +1 and 0.

Given reasons for the following features of transition meatal chemistr

1.	Given reasons for the following features of transition meatal chemistry : (i) The lowest oxide of a transition metal ( say, chromium , atomicnumber 24 ) is basic whereas the highest oxide is usualy acidic. (ii) Transition metals sometimes exhibit very low oxidation states such as +1 and 0.
Answer» SOLUTION :(i) Lowest oxide of Cr is CrOwhich is basic. The highest oxide is `CrO_(3)` which is acidic. ( In between `Cr_(2)O_(3)` is amphoteric ). Higher the oxidation state of the metal, more EASILY it can accept electron and hence greater is the acidic character. (ii) ` + 1` oxidation state is shown by Cu because after loss of one electron, it acqires stable CONFIGURATION of`3s^(10)`. Zero oxidation state is shown in forming metal carbonyls, e.g., `Ni(CO)_(4)` because`pi-` ELECTRONS donated by the ligands are accepted into the empty d orbitals.