I now realise my mistake, you are very correct. Am begining to come to my senses. Initialy whenever the word radi is mentioned, what comes to my mind is nothing but atomic radi. I never knew there are diffrences. I used to think that ionic, vandawal, atomic and convalent and metallic radi are all the same. But in this thread am discussing atomic radi. All the same, I say thank you for the awareness. I now accept that atomic radi decreases left to right across a period thus the nobles gases being at the extrem right of each row should have the smallest atomic radi. Thanks am now cleared.