Question

question 9 (1 point) which is the correct electron configuration for the element bromine (br)? a 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰3p⁵ b 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ c 1s²2s²2p⁶3s²3p⁶4s²4d¹⁰ d 1s²2s²2p⁶3s²3p⁶4s²3d⁴

Explanation:

Bromine has an atomic number of 35. The electron - filling order follows the Aufbau principle. After filling lower - energy orbitals 1s, 2s, 2p, 3s, 3p, 4s, then 3d, and finally 4p. The correct electron configuration is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵.

Answer:

B. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵