The d- and f- Block Elements Test - 4

Cu have an atomic number of 29 with electronic configuration of [Ar]3d¹⁰4s¹. On removal of 3 electrons to get Cu³⁺, an electronic configuration changes to [Ar] 3d⁸.

Atomic number of Mn is 25 with electronic configuration of  [Ar] 3d⁵ 4s². On removal of two electrons to get Mn²⁺, electronic configuration becomes [Ar] 3d⁵.

Magnetic moment is directly proportional to the total number of unpaired electrons. So it will be maximum for the element having maximum unpaired electrons i.e. d⁵ system.

Os shows maximum oxidation state of +8.

ZnSO₄ + 2NaHCO₃ →→ ZnCO₃ + Na₂SO₄ + H₂O + CO₂

HgCl₂ sublimes on heating and condenses in the form of small rhombic crystals. It was once used for the treatment of syphilis but is no longer used due to mercury toxicity.

A deliquescent subtstance is a substance which absorbs moisture from atmosphere until it dissolves in the absorbed moisture and forms a solution. ZnCl₂ is deliquescent.

In period, when we move from left to right, atomic radii first decreases till nickel and then starts increasing. Hence Ni²⁺ has smallest radii.

Cu²⁺,Ti³⁺ have same number of unpaired electrons i.e.1 and hence have same magnetic moment.

Al is not a d-block element but p- block element. It shows only one oxidation state. While rest all others are d-block elements which shows variable oxidation states.