The quantum number of the most energetic electron in an Ne atom in the first excited state is

1. 2, 1, 0, +1/2 2. 3, 1, 1, +1/2
3. 3, 0, 0, +1/2 4. 3, 1, 0, +1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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An atom forms an ion by losing three electrons. The ion has an electronic configuration [Ar]3d6. The symbol of the ion is :

1. Fe3+ 2. Ni3+
3. Co3+ 4. Mn+3
Subtopic:  Number of Electron, Proton & Neutron |
 69%
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The electronic transition in the hydrogen atom that emits maximum energy is:

1. 2  1

2. 1  4

3. 4  3

4. 3  2

Subtopic:  Hydrogen Spectra |
 65%
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The mass ratio of photons corresponding to the first lines of the Lymann and the Balmer series of the atomic spectrum of hydrogen is :

1. 5 : 27 2. 1 : 4
3. 27 : 5 4. 4 : 1
Subtopic:  Hydrogen Spectra |
 55%
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If the size of the first orbit of the hydrogen atom is 5.29 nm, the size of the second orbit of He+ is

1. 2.65 nm

2. 21.16 nm

3. 10.58 nm

4. 5.29 nm

Subtopic:  Bohr's Theory |
 69%
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The correct order of increasing energy of atomic orbital is: 

1. 3s, 3p, 4s, 3d, 4p

2. 3s, 3p, 3d, 4s, 4p

3. 3s, 3p, 4s, 4p, 3d

4. 3s, 3p, 3d, 4p, 4s

Subtopic:  AUFBAU Principle |
 80%
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An absorption line of the lowest frequency in the transition of hydrogen spectra is

1. n=1 to n=2

2. n=3 to n=8

3. n=2 to n=1

4. n=8 to n=3

Subtopic:  Hydrogen Spectra |
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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%
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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%
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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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