A student was asked to give the electron configuration for the element Iodine that has 53 electrons. The answer was given as [Ar] 5s2 4d10 5p5 His answer is not correct. Explain

the electron configuration:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, etc
Ar = [Ne] 3s² 3p⁶ ( 18)
Iodine = 53 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁵

if use Ar (18) ⇒ [Ar] 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁵

if use Kr (36) ⇒ [Kr] 5s², 4d¹⁰, 5p⁵

stupid i wont let you get a chance

explanation: