The reason for the unique position of hydrogen in the periodic table is to be explained. Concept introduction: Hydrogen is the first element of the periodic table and is also the lightest element. Hydrogen contains one electron and one proton. Its atomic form exists only at high temperatures. Hydrogen forms more compounds as compared to the other elements. The ground state electronic configuration of hydrogen is 1 s 1 . It resembles the alkali metals (group 1A); it can be oxidized to the H + ion. Hydrogen resembles the halogens (group 7A) as it forms hydride H − , which is isoelectronic to helium 1 s 2 .

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Chapter 24, Problem 5QP

Interpretation Introduction

Interpretation:

The reason for the unique position of hydrogen in the periodic table is to be explained.

Concept introduction:

Hydrogen is the first element of the periodic table and is also the lightest element.

Hydrogen contains one electron and one proton.

Its atomic form exists only at high temperatures.

Hydrogen forms more compounds as compared to the other elements.

The ground state electronic configuration of hydrogen is 1s1. It resembles the alkali metals (group 1A); it can be oxidized to the H+ ion.

Hydrogen resembles the halogens (group 7A) as it forms hydride H−, which is isoelectronic to helium 1s2.

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