F Block Elements Short Notes 

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The elements in which the additional electron enters in (n–2)f orbitals are called inner transition elements or f-block elements.

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Lanthanides are reactive elements so do not found in free state in nature.

LANTHANIDES

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LANTHANIDES

Most important minerals for lighter Lanthanides are – Monazite, cerites and for heavier lanthanides – Gadolinite and Xenotime

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All the lanthanoids are silvery white soft metals and tarnish rapidly in air.

Gen. Characteristics

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Gen. Characteristics

The hardness increases with increasing atomic number, samarium being steel hard.

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Density and other properties change smoothly except for Eu and Yb and occasionally for Sm and Tm.

Gen. Characteristics

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The elements in which the extra electron enters 5f-orbitals of (n – 2)th main shell are known as actinides.

ACTINIDES

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ACTINIDES

Th, Pa and U first three actinides are natural elements.

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