# 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 |
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In Rutherford's alpha scattering experiment using gold foil, the kinetic energy of the alpha particle was 1.2 x 10-12J. For a head on collision, using the formula K.E. = $\frac{1}{4{\mathrm{\pi \epsilon }}_{0}}$x 2Ze2/r0 , what may be the magnitude of r0 [ The nuclear radius of gold, Z=79; $\frac{1}{4{\mathrm{\pi \epsilon }}_{0}}$= 9 x 109 new-ton/meter2 coulomb-2, e= 1.6x10-19 coulomb]

1. 3 x 10-14m

2. 1.3 x 10-14m

3. 2.1 x 10-14m

4. 4.3 x 10-14m

Subtopic:  Introduction of Atomic Structure |
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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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The frequency of line spectrum of sodium is 5.09 x 1014 sec-1. Its wavelength (in nm) will be -[C= 3x108m/sec]

1. 510nm

2. 420nm

3. 589nm

4. 622nm

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The total number of neutrons in dipositive zinc ions with mass number 70 is -

1. 34

2. 40

3. 36

4. 38

Subtopic:  Number of Electron, Proton & Neutron |
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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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Consider an electron which is brought close to the nucleus of the atom from an infinite distance, the energy of the electron-nucleus system:

1. Increases

2. Decreases

3. Remains the same

4. None of these

Subtopic:  Bohr's Theory |
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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,

) m, where V is the voltage used for accelerating the electrons.

Calculate $\lambda$min for V= 5 x 104 volts.

1. 1.25 Å

2. 0.75 Å

3. 0.25 Å

4. 1.00 Å

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Calculate the de Broglie wavelength of an $\alpha$-particle emitted from radium having an energy of 4.8 MeV.

(Mass of $\alpha$-particle=6.6 x 10-24 g; h=Planck's constant = 6.626 x 10-27 erg sec)

1. 6.18 x 10-13cm

2. 0.58 x 10-8cm

3. 6.58 x 10-13cm

4. 4.12 x 10-11cm

Subtopic:  De Broglie 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 |
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