8.17 What is lanthanoid contraction? What are the consequences of lanthanoid contraction?
8.17 What is lanthanoid contraction? What are the consequences of lanthanoid contraction?
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1 Answer
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8.17 On moving along the lanthanoid series, the atomic number increases. Also, with the increase in atomic number, the number of electrons in the 4f orbital also increases.
The 4f electrons have a poor shielding effect. Therefore, the effective nuclear charge experienced by the outer electrons increases. Consequently, the force of attraction between the nucleus and valence electrons increases. This results in a decrease in the size of lanthanoids with the increase in the atomic number. This is termed as lanthanoid contraction.
CONSEQUENCES:
1. The properties of second and third transition series are similar in
2. Separation of lanthan
...more
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