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What is lanthanide contraction? How does it affect the chemistry of elements, which follow lanthanoids?

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What is lanthanide contraction? How does it affect the chemistry of elements, which follow lanthanoids?

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Decrease in atomic/ionic radii across lanthanoid series with increase in atomic number.

Due to lanthanoid contration the atomic/ionic radii 5 d Series elements decrease Consequently the properties of 4 d and 5 d series elements become similar.

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