1.

Which one of the following is the correct order of ionic radii?

Answer»

`Ce^(+3) lt La^(+3) lt PM^(+3) lt Yb^(+3)`
`Yb^(+3) lt Pm^(+3) lt La^(+3) lt Ce^(+3)`
`Yb^(+3) lt Pm^(+3) lt Ce^(+3) lt La^(+3)`
`Pm^(+3) lt La^(+3) lt Ce^(+3) lt Yb^(+3)`

ANSWER :C


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