Question

Atoms not always combine in a simple ratio to form a molecule explain how

Answer 1

It is often not true within inorganic chemistry (isomorphous substitution, fractional valences; e.g., ruby, sapphire). .
Both ruby and saphhire has general aluminium oxide formula,but both are different in occurance and other properties.
Atoms form molecules to obtain stability(by octet rule etc) but in these cases stability is obtained but not by simple ratios.
Some other thermochemical,solid state chemistry is there which ruled over the general Octet rule.
Thanks.
Tripathy.

Answer 2

It is often not true within inorganic chemistry (isomorphous substitution, fractional valences; e.g., ruby, sapphire). .
Both ruby and saphhire has general aluminium oxide formula,but both are different in occurance and other properties.
Atoms form molecules to obtain stability(by octet rule etc) but in these cases stability is obtained but not by simple ratios.
Some other thermochemical,solid state chemistry is there which ruled over the general Octet rule.