The hardest lanthanide element is:

S m

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L a

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G d

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D y

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Y b

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Solution

The correct option is C $G d$
Gadolinium ( $G d$ ) is the hardest Ianthanoid.

The hardness of few lanthanide elements on Vicker's scale is given below.

Lanthanides hardness $(M P a)$ are: $_{57} L a =$ 491, $_{62} S m =$ 412, $_{64} G d =$ 570, $_{66} D y =$ 540, $_{70} Y b =$ 206.

Hence, option $C$ is correct.

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