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B
Transition elements
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C
Noble gases
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D
All of the above
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Solution
The correct option is C Transition elements Non-stoichiometric compounds are formed by Transition elements.
A unique feature of the transition elements is that they form non-stoichiometric compounds. These are compounds of indefinite structure and proportions. For example, iron(II) oxide(FeO) should be written with a bar over the formula, FeO to indicate that the ratio of Fe and O atoms is not exactly 1 : 1.