Write short notes on Inner transition elements

1.	Write short notes on Inner transition elements
Answer» i. Elements placed at the bottom of the periodic table are called inner transition elements. ii. They include two series of elements: lanthanides and actinides and are also called as f-block elements. iii. 14 elements with atomic numbers 58 to 71 (Ce to Lu) are called Lanthanides. These elements are placed along with lanthanum (La = 57) in group 3 and period 6 because of very close resemblance in properties between them. iv. 14 elements with atomic numbers 90 to 103 (Th to Lr) are called Actinides. These elements are placed along with actinium (Ac = 89) in group 3 and period 7 because of very close resemblance in their properties. v. They have three incomplete outermost shells. vi. All these elements are metals.

Answer»

i. Elements placed at the bottom of the periodic table are called inner transition elements.

ii. They include two series of elements: lanthanides and actinides and are also called as f-block elements.

iii. 14 elements with atomic numbers 58 to 71 (Ce to Lu) are called Lanthanides. These elements are placed along with lanthanum (La = 57) in group 3 and period 6 because of very close resemblance in properties between them.

iv. 14 elements with atomic numbers 90 to 103 (Th to Lr) are called Actinides. These elements are placed along with actinium (Ac = 89) in group 3 and period 7 because of very close resemblance in their properties.

v. They have three incomplete outermost shells.

vi. All these elements are metals.

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