The radius of potassium ion

The radius of potassium ion radius cd p:.tesStrn aten•n is 0.203 nm- cf in be 0231 14) 0.251

Dear student,

The correct option is (1) 
Reason :   K   K+  +  e-1 
      Due to the formation of cation outermost electrons comes closer to the nucleus thus radius must be lower than 0.203 nm
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