Chapter 10, Problem 119A

Interpretation Introduction

Interpretation: To determine the transition elements.

Concept Introduction: Transition metals are metals in which the outermost electrons are present in the d-orbital. It is also called d-block elements. They can be placed in the mid of the s-block and p-block of the periodic table.

Answer to Problem 119A

The transition metal will be Cr, Cu, Cd, and Co.

Explanation of Solution

Transition metals are the metal in which the outermost electrons are present in d-orbital. It is also called d-block elements. These are 3d-elements because the outermost electrons are present in 3d-orbital.

The followings are transition metals,

Cr-24= ${\text{1s}}^{\text{2}}{\text{2s}}^{\text{2}}{\text{2p}}^{\text{6}}{\text{3s}}^{\text{2}}{\text{3p}}^{\text{6}}{\text{4s}}^{\text{1}}{\text{3d}}^{\text{5}}$

Cd-48 = ${\text{[Kr]4d}}^{\text{10}}{\text{5s}}^{\text{2}}$

Cu-29= ${\text{[Ar]3d}}^{\text{10}}{\text{4s}}^{\text{1}}$

Co-28= ${\text{[Ar]3d}}^7{\text{4s}}^2$

Among all Cr, Cu and Co are 3d- elements and Cd is 4d-element.