Question

1) Why is hydrogen called a 'rogue elements?
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Answer 1

Answer:

Explanation:

hydrogen is termed as a rogue element in the periodic table as it behaves like alkali metal, have one valence electron and can form halides and also have properties of halogens also, gives H- when gains an electrons.

Answer 2

Answer:

Question

1) Why is hydrogen called a ' rogue elements' ?

Answer

While arranging the elements in increasing order of their atomic weights , Mendeleev observed that hydrogen shows similarity with both alkali metals of group - lA as well as with halogens of group - VIIB . so , hydrogen was placed in both group - IA and group - VIIB . Mendeleev faced difficulty in ascertaining a definite position for hydrogen and so he named it a ' rogue element '.