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Transition elements from complexes due which of the following reason?
- Para magnetism
- Vacant d-orbitals
- Large nuclear charge
- Small cation size
Vacant orbitals of central metal atom or iron are filled by ligands to form metal complexes.
In Chemistry, a coordination complex or metal complex consists of a central atom or ion which is usually metallic and is called the coordination center and a surrounding array of bound molecules or ions that are in turn known as ligands or complexing agents. Many metal containing compounds, especially those of transition metals are coordination complexes.
Basics of Chemistry
Non-stoichiometric compounds are formed by:
- Only alkali metals
- Only transition elements
- Only noble gases
- None of the above
Only transition elements
Binary transition metal compounds, such as the oxides and sulfides, are usually written with idealized stoichiometry’s, such as FeO or FeS but these compounds are usually cation deficient and mostly never contain a 1:1 cation:anion ratio. Thus a substance such as ferrous oxide is actually a nonstoichiometric compound with a range of compositions.
Gases, Liquids & Solids
Which of the following properties is anisotropic?
- Melting Point
- Electrical Conductivity
- Geometrical Shape
Physical properties that depend on the direction are called anisotropic properties. The physical properties of crystalline solids like refractive index, coefficient of thermal expansion, electrical and thermal conductivity, and cleavage plane are anisotropic in nature.