Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 138

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11th CBSE

IMPORTANT

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The maximum number of electrons that can have principal quantum number, $n = 3$ , and spin quantum number, $m_{s} = - \frac{1}{2}$ , is

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Important Questions on Structure of Atom

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 139

The atomic masses of

' He' and' Ne'

are

4 and 20 a . m . u

. respectively. The value of the de Broglie wavelength of

' He' gas at - 73 ° C is " M "

times that of the de Broglie wavelength of

' Ne' at 727 ° C .' M'

is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 140

In an atom, the total number of electrons having quantum numbers,

n = 4, | m_{l} | = 1 and m_{s} = - 1 / 2 is

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11th CBSE

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 141

Not considering the electronic spin, the degeneracy of the second excited state of

H^{-}

is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 142

For the following question, enter the correct numerical value, (in decimal-notation, truncated/rounded-off to the second decimal place,

e . g ., 6.25, 7.00, - 0 \cdot 33, 30 \cdot 27, - 127 \cdot 30)

using the mouse and the onscreen virtual numeric keypad in the place designated to enter the answer.
The atomic spectrum of hydrogen is found to contain a series of lines of wavelengths

656.46, 486 \cdot 27, 434.17 and 410 \cdot 29 nm

. The wavelength (in nm) of the next line in the series will be _____.