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  • I need help with - d - and f - BLOCK ELEMENTS - JEE Main-2

The radius of La^{3+} (Atomic number of La = 57) is 1.06 \AA . Which one of the following given values will be closest to the radius of Lu^{3+}  (Atomic number of Lu = 71)?

  • Option 1)

    1.60\; \AA

  • Option 2)

    1.40\; \AA

  • Option 3)

    1.06\; \AA

  • Option 4)

    0.85\; \AA

 

Answers (1)

best_answer

As we learnt in

Ionic Radii -

As atomic radii, ionic radii also decrease with increase in atomic number.In +3 oxidation state.

 

-

 

 Due to lanthanoid contraction, size of lanthanoid ions decreases from La3+ to Lu3+ 


Option 1)

1.60\; \AA

This option is incorrect.

Option 2)

1.40\; \AA

This option is incorrect.

Option 3)

1.06\; \AA

This option is incorrect.

Option 4)

0.85\; \AA

This option is correct.

Posted by

divya.saini

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