JEE Mains · Chemistry · STD 11 - 2. structure of atom
Which of the following is correct set of \(4\) quantum numbers of \(19^{th}\) electron in Chromium (Atomic number \(= 24\)) in accordance with Aufbau principle?
- A \(n = 3, l = 2, m = +2, s = +\dfrac{1}{2}\)
- B \(n = 3, l = 2, m = -2, s = +\dfrac{1}{2}\)
- C \(n = 4, l = 1, m = 0, s = +\dfrac{1}{2}\)
- D \(n = 4, l = 0, m = 0, s = +\dfrac{1}{2}\)
Answer & Solution
Correct Answer
(D) \(n = 4, l = 0, m = 0, s = +\dfrac{1}{2}\)
Step-by-step Solution
Detailed explanation
The atomic number of Chromium is \(24\). According to the Aufbau principle, the order of filling of electrons is \(1s, 2s, 2p, 3s, 3p, 4s, 3d\). The electronic configuration of the first \(18\) electrons is \(1s^2 2s^2 2p^6 3s^2 3p^6\). The \(19^{th}\) electron enters the \(4s\)…
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