JEE Main 2024 Chemistry question
The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are
Answer: (A)
Solution
K (Z = 19): 1s²2s²2p⁶3s²3p⁶4s¹. The outermost electron is in 4s: n = 4, ℓ = 0, m = 0, s = +½.