Question

EXPLAIN WHY HYDROGEN IS PLACED FIRST IN PERIODIC TABLE❓❓❓

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Answer 1

Answer:

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Explanation:

The hydrogen is placed 1 st in periodic table because it has ns1 electron configuration like the alkali metal

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Answer 2

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ANSWER :

Hydrogen is placed in group I of the modern periodic table due to following reasons:-

(1) It shows outer electronic configuration similar to group I elements (i.e.1s1).

(2) It readily looses its electron to form H+ ion which resembles the electropositive character of group I elements.

(3) It shows +1 oxidation state like alkali i.e. group Ielements.

(4) Hydrogen also acts as a strong reducing agent like alkali metals and also forms binary compounds with electronegative elements which resembles the group I elements.

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