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What is Lanthanoid contraction?

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What is Lanthanoid contraction?

Posted by Sakshi Shrivastava 8 years ago

CBSE > Class 12 > Chemistry

2 answers

Srishti Thakur 8 years ago

The 4th-electrons have poor shielding effect,so effective nuclear charge experienced by the outer electrons increases.This result in a steady decrease in size of lanthanides. This is known as lanthanoid contraction

Jayash Pandey 8 years ago

Contraction means the decrease in size. So, lanthanide contraction means the decrease in size of the elements down the group(lanthanide).

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