What are the formulae of the compounds formed when lanthanoids $(Ln)$ react with nitrogen and halogen respectively?
- A$LnN$ and $LnX_3$
- B$LnN_3$ and $LnX$
- C$(Ln)_2 N_3$ and $LnX_3$
- D$LnN$ and $LnX$
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$1.$ The atomic radii of the elements of the third transition series are .......... to those of the corresponding elements of the second transition series.
$2.$ Samarium melts at .......... $K$.
$3.$ The color of lanthanoid ions is due to the presence of .......... electrons.
$1.$ The atomic radii of the elements of the third transition series are .......... to those of the corresponding elements of the second transition series.
$2.$ Samarium melts at .......... $K$.
$3.$ The color of lanthanoid ions is due to the presence of .......... electrons.
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What is the general formula of lanthanoid hydroxide? (Consider $Ln$ as any lanthanoid element)
Which of the following elements are included in the actinoid series?
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