In a ground-state phosphorous atom in the gas phase, how many electrons have quantum numbers n = 3, l = 1, and m_l = –1?

1. Zero (0)

2. One (1)

3. Two (2)

4. Three (3)

The number of electrons plus neutrons in \(_{19}^{40}K^{+}\) is:

1.  38

2.  59

3.  39

4.  40

Orbital having 3 angular nodes and 3 total nodes is:

1. 5 p
2. 3 d
3. 4 f
4. 6 d

Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?

1. Brackett series

2. Lyman series

3. Balmer series

4. Paschen series

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

The radii of the first bohr orbit of H(r_H), He⁺ (r_He⁺) and Li2+(r_Li²⁺) are in the order:

1.  r_H = r_He⁺ = r_Li⁺²

2.  r_H < r_He⁺ < r_Li²⁺

3.  r_H > r_He⁺ > r_Li²⁺

4.  r_He⁺ < r_H < r_Li²⁺

Consider the following sets of quantum numbers:

Which of the following sets of quantum numbers is not possible?

1. ii, iii, and iv
2. i, ii, iii, and iv
3. ii, iv and v
4. i and iii

Based on equation E = –2.178 × 10^–18J, $\frac{{\mathrm{Z}}^2}{{\mathrm{n}}^2}$ certain conclusions are written. Which of them is not correct?