Question

when carbon dioxide is formed, one carbon atom forms double covalent bonds with two oxygen atoms. carbon dioxide is considered
a less stable than the individual atoms because it is a gas.
b less stable than the individual atoms because it can be decomposed readily.
c more stable than individual atoms as now the outer energy levels of all atoms are filled.
d more stable than the individual atoms because together they form a more massive substance.

Explanation:

Atoms form bonds to fill outer energy levels (octet rule). In CO₂, C and O atoms achieve filled outer shells via double bonds, making the molecule more stable than individual atoms. Options A (gas ≠ instability), B (CO₂ isn't readily decomposed), D (mass ≠ stability) are wrong.

Answer:

C. more stable than individual atoms as now the outer energy levels of all atoms are filled.