Answers

2016-02-04T23:50:31+05:30
Group 17 has f,cl,br,i,and their atomic size increase down the group.
due to smaller size of fluorine as compared to chlorine .6 smaller size fl atom can can be join except six bigger size cl atom around scl6,
another lone pair in f is smaller 2p orbital rather than chlorine has bigger 2p orbital. therefore the interaction between lone pair of fluorine is strongly attached to the s 
0