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11th Standard English Medium Chemistry Subject Quantum Mechanical Model of Atom Creative 2 Mark Questions with Solution Part - II updated Creative Questions

Published on: 13/05/2022

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Questions:

Generic 2

4 x 2 = 8

How many electrons that can be accommodated in the subshell s, p, d, f?

How many electrons can be accommodated in the main shell I,m and n?

Explain about the significance of de Broglie equation.

Explain how matter has dual character?

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Answers Key:

Generic 2

4 x 2 = 8

Sub shell	s	p	d	f
Azimuthal quantum number	0	1	2	3
Total number of electrons in the sub shell 2(2l +1)	2(2 x 0 + 1)=2	2(2 x 1 + 1)=6	2(2 x 2 + 1)=10	2(2 x 3 + 1)=14

Main shell	l	m	n
Principal quantum number	2	3	4
Number of electrons in the main shell 2n²	2(2)²= 8	2(3)²= 18	2(4)²= 32

(i) \(\lambda =\frac{h}{mv}\). This equation implies that a moving particle can be considered as a wave and a wave can exhibit the properties of a particle.
(ii) For a particle with high linear momentum (mv) the wavelength will be so small and cannot be observed.
(iii) For a microscopic particle such as an electron, the mass is of the order of 10^-31 kg, hence the wavelength is much larger than the size of atom and it becomes significant.
(iv) For the electron, the de Broglie wavelength is significant and measurable while for the iron ball it is too small to measure, hence it becomes insignificant.

(i) Albert Einstein proposed that light has dual nature. i.e. like photons behave both like a particle and as a wave.
(ii) Louis de Broglie extended this concept and proposed that all forms of matter showed dual character.
(iii) He combined the following two equations of energy of which one represents wave character (hv) and the other represents the particle nature (mc²).