Question

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Answer 1

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Explanation:

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Answer 2

3. The possible existence of a second rare-earth-like group of elements beginning with uranium and extending to the transuranic elements, is discussed by a calculation of the atomic eigen-functions of the 4f and 5felectrons.

2.The decrease in size of lanthanide ion due to increase in atomic number is known as lanthanide contraction. Consequences of lanthanide contraction: • Hard to separate the lanthanides • Increase in electronegativity • Increase in ionisation energy • Ability of complex formation decreases