Chemistry · Periodicity in Elements

Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by a ratio of small natural numbers.

Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by a ratio of small natural numbers.

Therefore, alkali metals are non stoichiometric compounds.

The existence of nonstoichiometric compounds is related to the presence of defects in the lattice structures of crystalline substances, such as the absence of ions from sites that would normally be occupied.

A unique feature of the transition elements is that they form non-stoichiometric compounds. These are compounds of indefinite structure and proportions

A very common example of such a compound is iron(II) oxide(FeO) in which the ratio of Fe and O atoms is not exactly 1: 1. The formula becomes Fe(0.96)O resulting from defects in the compound FeO.

Non-stoichiometry is shown particularly among transition metal compounds of the group 16 elements (O, S Se, Te). It is mostly due to the variable valency of transition elements.

Non-stoichiometric compounds are formed only by transition metals so only option B can be correct.

Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by a ratio of small natural numbers.

Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by a ratio of small natural numbers.