Chapter 18, Problem 74E

Interpretation Introduction

Interpretation: The physiological importance of selenium needs to be explained.

Concept Introduction: In the Long form of periodic table, the non-metals are mainly placed at the right side of the periodic table that is called as p-block elements. All non-metals are placed in p-block element. Metals make the 75 % part of the periodic table.

Metals are electropositive elements and mainly form ionic compound whereas non-metals are electronegative elements and can form either covalent or ionic compounds.