All Students Notes

Question 1. Why are d-block elements called transition elements? Answer. d-block elements are the elements present between s- and p-block elements. These are called transition elements because they show transition (change) in properties on moving from s-block elements to p-block elements in periodic table. For example, metallic properties of elements change to non-metallic passing through transition elements. Question 2:Why do the d-Block elements show different oxidation states? Answer: Transition elements show different oxidation states in their compounds. Explanation is very simple. These elements have several ns and (n-1) d electrons for bond formation.  Due to small  energy gap between ns and (n-1) d orbitals, all electrons present in these orbitals can participate in chemical bonding. Question 3.Why does Mn show the maximum oxidation number of oxidation state in 3d series? Answer. Ability of transition element to show variable valen...