The bromine atom possesses 35 electrons. It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electrons in 4p orbital. Which of these electron experiences the lowest effective nuclear charge?
The bromine atom possesses 35 electrons. It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electrons in 4p orbital. Which of these electron experiences the lowest effective nuclear charge?

The nuclear charge that electrons (which are present in atoms containing multiple electrons) feel is determined by the distance between their orbital and the atom’s nucleus. The smaller the effective nuclear charge, the greater the distance. 4p orbitals are the furthest from the nucleus of the bromine atom with (+35) charge among the p-orbitals. As a result, electrons in the 4p orbital are the ones that have the lowest effective nuclear charge. These electrons are additionally protected by electrons in the 2p and 3p orbitals, as well as electrons in the s-orbitals.