Question

Justify position of hydrogen in periodic table.
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Answer 1

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Hydrogen is the first element of the periodic table. Its electronic configuration is [1s 1 ]. Due to the presence of only one electron in its 1s shell, hydrogen exhibits a dual behaviour, i.e., it resembles both alkali metals and halogens.

Answer 2

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• Justify position of hydrogen in periodic table.

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Hydrogen with atomic number 1 and electronic configuration 1s¹ is the first element in the periodic table. It resembles alkali metals as well as halogens. Hence, its position is anomalous. Some chemists argue that hydrogen should be placed along with alkali metals whereas other chemist argue that hydrogen should be placed with halogens.

$\huge\fcolorbox{black}{aqua}{\underline{Explanation !}}$

Hydrogen is the first element of the periodic table. Its electronic configuration is [1s 1 ]. Due to the presence of only one electron in its 1s shell, hydrogen exhibits a dual behaviour, i.e., it resembles both alkali metals and halogens.

Resemblance with alkali metals:

1. Like alkali metals, hydrogen contains one valence electron in its valency shell.

H : 1s¹

Li : [He] 2s¹

Na ; [Ne]3s¹

Hence, it can lose one electron to form a unipositive ion.

2. Like alkali metals, hydrogen combines with electronegative elements to form oxides, halides, and sulphides.

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