which is the electron configuration for bromine?\n1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵\n1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶\n1s²2s…

Explanation:

Step1: Recall bromine's atomic number

Bromine has atomic number 35.

Step2: Fill orbitals according to Aufbau principle

1s can hold 2 electrons, 2s 2 electrons, 2p 6 electrons, 3s 2 electrons, 3p 6 electrons, 4s 2 electrons, 3d 10 electrons and then remaining 5 in 4p. So the electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$.

Answer:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$ (First option)