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Chemistry - Urgent - help Question in ppr 2

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moon:
plz help me to solve this question. thanx in advance.

element       Atomic radius/pm          Ionic radius/pm

lithium                   152                    ??????
sodium                  186                       95
potassium              227                      138

elemis:
Is the answer 59 ?

moon:

--- Quote from: Ari Ben Canaan on November 02, 2010, 01:32:50 pm ---Is the answer 59 ?

--- End quote ---

No Ari the answer is 78.

iluvme:
(95/186)*152

Deadly_king:

--- Quote from: moon on November 02, 2010, 01:03:17 pm ---plz help me to solve this question. thanx in advance.

element       Atomic radius/pm          Ionic radius/pm

lithium                   152                    ??????
sodium                  186                       95
potassium              227                      138

--- End quote ---

Hmm..............are you sure we need to find the ionic radius exactly?

Or is it just an estimate?

Koz i've never come across such a question. :-[

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