Question

formation of hydrogen molecule takes place by sharing of electrons and not by transfer of electrons.Give reason

Answer 1

it is so because hydrogen only has one electron so it can only loose or share tha4th one electron to become stablebut as if H lose 1electron it would have no more electron left within it so it can't lose ,so to attain stability it it shares its e and become stable bY completing duplet
I hope this would be helpful

Answer 2

Answer:

To attain stable electronic configuration of nearest noble gas configuration i.e. 2 electrons in valence shell (Duplet rule) share one electron.

Both atoms of hydrogen in hydrogen molecule are short of 1 electron in valence shell and to have stable electronic configuration of nearest noble gas they share 1 electron each in valence shell and no transfer of electron takes place in that case H-atom will cease to exist.

And another reason is that -

Hydrogen is a non metal and the bonding bonding between non metal and non metal is covalent bond which is formed by sharing of electrons.