Give reason: In the first period, hydrogen and helium are not placed adjacent to each other OR There is a big gap between hydrogen and helium in the periodic table.

Give reason: In the first period, hydrogen and helium are not placed adjacent to

each other

OR

There is a big gap between hydrogen and helium in the periodic table.
by

1 Answer

Answer :

Because Hydrogen and Helium belong to different groups. The Hydrogen element

belongs to the 'Hydrogen' group, whereas the Helium element belongs to the 'noble gas'
by

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