JEE Main 2026 (Online) 4th April Morning Shift | Structure of Atom Question 9 | Chemistry

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

$$ n=3, l=2, m=+2, s=+\frac{1}{2} $$

$$ n=3, l=2, m=-2, s=+\frac{1}{2} $$

$$ n=4, l=1, m=0, s=+\frac{1}{2} $$

$$ n=4, l=0, m=0, s=+\frac{1}{2} $$

JEE Main 2026 (Online) 2nd April Morning Shift

MCQ (Single Correct Answer)

-1

What is the energy (in J atom⁻¹) required for the following process?

Li²⁺ (g) → Li³⁺ (g) + e⁻

(Take the ionization energy for the H atom in the ground state as $2.18 \times 10^{−18} \text{ J atom}^{−1}$)

$8.72 \times 10^{−18}$

$1.962 \times 10^{−18}$

$1.962 \times 10^{−17}$

$6.54 \times 10^{−17}$

JEE Main 2026 (Online) 28th January Evening Shift

MCQ (Single Correct Answer)

-1

The wavelength of photon 'A' is 400 nm. The frequency of photon 'B' is $10^{16} \ \text{s}^{-1}$. The wave number of photon 'C' is $10^4 \ \text{cm}^{-1}$. The correct order of energy of these photons is :

A > C > B

C > B > A

B > A > C

A > B > C

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