Atomic number of hydrogen is 1 and the atomic number of fluorine atom is 9. Write the formation of hydrogen fluoride (HF).

Explanation

A molecule of hydrogen fluoride (HF) is composed of one atom of hydrogen and one atom of fluorine. Both the hydrogen and fluorine atoms contribute one valence electron each so that a pair of electrons (:) is formed. This pair of electrons is shared between H and F atoms and a covalent bond in hydrogen fluoride (HF) is formed.

After sharing a pair of electrons, hydrogen completes its duplet and fluorine completes its octet.