Explanation:
As the shielding effect is the effect which occurs when electrons shield each other from being attracted by the nucleus.
The effective nuclear charge is the net effective positive charge experienced by the electrons in an atom.
The electronic configuration of bromine is as follows.
[tex]1s^{2} 2s^{2} 2^p{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{5}[/tex]
Since, 1s orbital is closure to the nucleus hence it will experience the greatest nuclear charge.
The atomic orbital in which an electron in a bromine atom experience the greatest effective nuclear charge is the 1s atomic orbital.
The electron configuration of bromine is as follows;
From Coulumb's law of electrostatic forces, the greater the distance between charges, the less is the effective nuclear charge felt.
Ultimately, the orbital in a bromine atom which experiences the greatest effective nuclear charge is the 1s orbital.
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