1.

State perfect order of ionic radii.

Answer»

`Lu^(3+) LT Yb^(3+) lt Eu^(3+) lt La^(3+)`
`La^(3+) lt Eu^(3+) lt Yb^(3+) lt Lu^(3+)`
`La^(3+) lt Eu^(3+) lt Lu^(3+) lt Yb^(3+)`
`Lu^(3+) lt Eu^(3+) lt La^(3+) lt Yb^(3+)`

Solution :While going from left to right in the periodic table as ATOMIC number increases. Their atomic radii DECREASES. So ionic radii also decreases.
`""_(71)Lu lt ""_(70)Yb lt ""_(63)Eu lt ""_(57)La`


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