JEE Main 2026 · 4 Apr · Shift 1 · Chemistry Q53

ChemistrySingle correct+4 / -1Question 53 of 75

Which of the following is correct set of 4 quantum numbers of 19th electron in Chromium (Atomic number = 24) in accordance with Aufbau principle?

n=3,\ l=2,\ m=+2,\ s=+\frac12

n=3,\ l=2,\ m=-2,\ s=+\frac12

n=4,\ l=1,\ m=0,\ s=+\frac12

n=4,\ l=0,\ m=0,\ s=+\frac12

Answer and worked solution

Official answer: D

Aufbau order. $1s^2\,2s^2\,2p^6\,3s^2\,3p^6$ holds 18 electrons; the 19th enters 4s.

Quantum numbers. $n=4$ , $l=0$ , $m=0$ , $s=+\frac12$ .

(D)

Topics:Quantum numbers Electronic configuration

JEE Main 2026 · 4 Apr · Shift 1, Chemistry question 53