Question

Explain the position of hydrogen in the periodic table on the basis of its electronic configuration.

Answer 1

Hey SarvJeet,

◆ Position of Hydrogen in modern periodic table -

- Hydrogen is first element of periodic table with atomic number 1.

- Electronic configuration of H is given by [H] = 1s1 .

- Its last electron is unpaired in s shell like other alkali metals.

- Therefore, it is placed in the 1st group above alkali metals.

Hope this helped you. Thanks for asking..

Answer 2

Answer:

(1) Hydrogen has atomic number 1 and electronic configuration 1s¹, similar to the outermost electronic configuration of alkali metals ns¹

(2) It forms univalent ion similar to alkali metal

(3) It forms oxides, halides and sulphides like alkali

(4) Hydrogen resembles halogens of the properties like, high ionisation enthalpy, formation of uninegative ion $\sf{(H^-)}$, formation of hydrides with many elements, formation of a large number of covalent compounds, existence as a diatomic molecule $\sf(H_2)$.

(5) Hence, due to its unique behaviour hydrogen is placed separately in the periodic table.