Which of the following sets of quantum numbers represent an impossible arrangement?
 

n m  s
1. 3 2   -2  (+)\(\frac{1}{2}\)
2. 4 0  (-)\(\frac{1}{2}\)
3. 2 -3 (+)\(\frac{1}{2}\)
4. 5 (-)\(\frac{1}{2}\)

                  

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 74%
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Correct set of four quantum numbers for the outermost electron of rubidium (Z=37) is:

1. 5, 0, 0, 1/2

2. 5, 1, 0, 1/2

3. 5, 1, 1, 1/2

4. 6, 0, 0, 1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 75%
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The quantum numbers of four electrons are given below.

                                  n            l           m          s 

(1) Electron 1             3            0             0           -1/2

(2) Electron 2             4            0             0           1/2

(3) Electron 3            3             2             0           1/2

(4) Electron 4            3             1             0           -1/2

The correct order of decreasing energy of these electrons is - 

1. Electron 3 > Electron 1 > Electron 4> Electron 2

2. Electron 4> Electron 2 > Electron 3 > Electron 1

3. Electron 3 > Electron 2 > Electron 4 > Electron 1

4. Electron 2 > Electron 4 > Electron 3 > Electron 1

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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With a certain exciting radiation of a particular frequency, to which hydrogen atoms are exposed, the maximum number of spectral lines obtainable in the emission is 15. The uppermost energy level to which the electron is excited is 

1. 4

2. 5

3. 6

4. 7

Subtopic:  Hydrogen Spectra |
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When accelerated electrons are direct against an anticathode in an X-ray tube, the radiation obtained has a continuous spectrum with a wavelength minimum,

λmin = (1.24 x 10-6)V) m, where V is the voltage used for accelerating the electrons.

Calculate λmin for V= 5 x 104 volts.

1. 1.25 Å

2. 0.75 Å

3. 0.25 Å

4. 1.00 Å

Subtopic:  Electromagnetic Radiation |
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The wavelengths of two photons are 2000 Å and 4000 Å respectively. What is the ratio of their energies?

1. 1/4

2. 4

3. 1/2

4. 2

Subtopic:  Planck's Theory | Electromagnetic Radiation |
 76%
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The ion that is isoelectronic with CO is-

1. CN-

2. O2+

3. O2-

4. N2+

Subtopic:  Number of Electron, Proton & Neutron |
 85%
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If frequency of the X-rays produced using an element as anti-cathode is found to be 2500 sec-1, the atomic number of used element is (a, b= 1)

1. 51

2. 49

3. 56

4. 72

Subtopic:  Introduction of Atomic Structure |
 50%
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When the atoms of gold sheet are bombarded with a beam of α -particles, only a few a-particles get deflected where as most of them go straight undeflected. This is because:

1. The force of attraction on the α-particles by the oppositely charged electron is not sufficient.
2. The nucleus occupies much smaller volume as compared to the volume of atom.
3. The force of repulsion on fast moving α-particles is very small.
4. The neutrons in the nucleus do not have any effect on α-particles.

Subtopic:  Introduction of Atomic Structure |
 83%
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The number of electrons in the valence shell of calcium is 

1. 6

2. 8

3. 2

4. 4

Subtopic:  Number of Electron, Proton & Neutron |
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