Why does Zr and Hf exhibit similar properties?
Name a transition element which does not exhibit variable oxidation states.
Why do the transition elements exhibit higher enthalpies of atomisation?
Why is the following electronic configuration not correct for the ground state of Mo atom? (at. no. = 42).1s2 2s2 2p6 3s23p63d10 4s2 4p6 4d4 5s2.