Give general electronic configuration of `d`-block elements.

(a) Define transition metals. (b) Why do transition metals form coloured complexes ? (c) Give general electronic configuration of f-block elements.

Give general electronic configuration of s- block elements.

Give general electronic configuration of f -block elements.

(a) Define transition elements. (b) Give general electronic configuration of f-block elements.(c ) Most of transition elements are coloured, why? (d ) Transition elements show variable oxidation states, why?

(i) Give the general electronic configuration of d-block elements, (ii) Silver atom has completely filled d-orbitals (4d^10) in its ground state. Yet, it is considered as transition element. Why? (iii) Cu^+ ion is not stable in aqueous solution. Explain. (iv) Actinoids contraction is greater from element to element than lanthanoid contraction. Why?

Write general electronic configuration of p -block elements.