Why do some atoms form chemical bonds while others do not?

An atom that gains or loses an electron to form an ion is more stable than a neutral atom if the ion gets a full electron shell by forming the ion. Because oppositely charged ions attract each other, these atoms will readily form chemical bonds with each other.

Atoms of these elements have full outer electron shells. These atoms are stable and very rarely form bonds with other atoms. If the electronegativity values between two atoms are comparable, they may still form chemical bonds to increase the stability of their valence electron shell

Explanation:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.