The maximum wavelength in the Lyman series of He⁺ ion is-

1. 3R

2. 1/3R

3. 1/R

4. 2R

 When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

The number of orbitals that are possible at the L-energy level is

1. 2

2. 4

3. 6

4. 1

The number of electrons in  ₁₉ K with quantum numbers n=3; l=0 is/are:

1. 2

2. 1

3. 4

4. 3

The transition in the He⁺ ion in the balmer series that would have the same wave number as the first Lyman line in the hydrogen spectrum is-

Which of the following has greater number of electrons than neutrons?

1. Al³⁺

2. O^2-

3. F^-

4. C

What is the correct family and electronic configuration for element Z = 114?

1. Halogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁵

2. Carbon family, [Rn]5f¹⁴6d¹⁰7s²7p²

3. Oxygen family, [Rn]5f¹⁴6d¹⁰7s²7p⁴

4. Nitrogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁶

The number of electrons that can be fit into the orbital for which n = 3 and l = 1, is:

1. 2

2. 6

3. 10

4. 14

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are

1. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²

2. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²

3. [Xe]4f⁷6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²

4. [Xe]4f⁷6s², [Xe]4f⁸6s² and [Xe]4f⁸5d¹6s² 

The magnetic moment of 2.84 BM can be shown by:  

(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. Ni²⁺

2. Ti³⁺

3. Cr³⁺

4. Co²⁺