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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