Question

What is lanthanoids and actinoids​

Answer 1

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F block elements

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Answer 2

Answer:

Lanthanoids include elements 58-71 and actinoids include elements 90-103. Lanthanoids cause the atomic radii of elements after them to be much lower than expected, due poor 4f-orbital shielding. This is called lanthanide contractions. Actinoids are all radioactive and most of them are not naturally found on the earth.

Explanation:

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