Question

the hydrogen atom, h, has an electron configuration of 1s1. it has one unpaired electron in its only electron orbital, 1s. the helium atom, he, has an electron configuration of 1s2. it has one pair of electrons in its only electron orbital (or shell), 1s. why is hydrogen more likely to form h2 than helium is to form he2?

Answer 1

Hydrogen is more likely to form $H_{2}$  because the outer orbital of hydrogen is half filled which make it available for sharing the electron

Helium is a noble gas in which atom have filled outer orbital i.e., the s orbital is filled which make it inappropriate for sharing of electron to become $He_{2}$. Moreover helium atoms prefer to make bonds with the other atoms i.e., Cl, Br and other different metals and non-metals.

While hydrogen has half filled outer orbital which make it appropriate for sharing of electron to become $H_{2}$.

The major reason is that hydrogen atom has fewer electron orbital than helium .Hence, after having 1 electron in hydrogen and no electron in s orbital in helium than also hydrogen form $H_{2}$

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