The bromine atom possesses 35 electrons .it contains 6 electrons in 2p orbitals 6 elecrons in 3p orbital and 5 electron in 4p orbitals which of these electron experience the lowest effective nuclear charge

Explanation

4p orbital has less effective nuclear charge
As n=4 is more than n=2 of 2p and n=3 of 3p . `2p to 3p to4p` successive energy increase .So there is less attraction of nucleus on 4p .