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

1. 2

2. 1

3. 4

4. 3

Subtopic:  Number of Electron, Proton & Neutron |
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The number of orbitals that are possible at the L-energy level is

1. 2

2. 4

3. 6

4. 1

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 64%
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The maximum wavelength in the Lyman series of He+ ion is-

1. 3R

2. 1/3R

3. 1/R

4. 2R

Subtopic:  Hydrogen Spectra |
 66%
From NCERT
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 When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

1. 3 2. 4
3. 6 4. 10
Subtopic:  Hydrogen Spectra |
 74%
From NCERT
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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-

1. \(2 \rightarrow1\) 2. \(5 \rightarrow3\)
3. \(4 \rightarrow2\) 4. \(6 \rightarrow4\)
Subtopic:  Hydrogen Spectra |
 62%
From NCERT
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Which of the following has greater number of electrons than neutrons?

1. Al3+

2. O2-

3. F-

4. C

Subtopic:  Number of Electron, Proton & Neutron |
 75%
From NCERT
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The group number and electronic configuration of  element Z =114 is: 

1. Halogen family, [Rn]5f146d107s27p5

2. Carbon family, [Rn]5f146d107s27p2

3. Oxygen family, [Rn]5f146d107s27p4

4. Nitrogen family, [Rn]5f146d107s27p6

Subtopic:  AUFBAU Principle |
 76%
From NCERT
NEET - 2017
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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

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
From NCERT
NEET - 2016
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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 

Subtopic:  AUFBAU Principle |
 57%
From NCERT
NEET - 2016
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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+

Subtopic:  AUFBAU Principle |
 69%
From NCERT
NEET - 2015
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