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

Published on: 25/06/2021

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Std: 11th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

How many radial f spherical nodes will be present in 5f orbital?

Bring out the similarities and dissimilarities between a 1s and 2s orbital.

At what distance is the radial probability maximum for 1s orbital? What is this distance called?

Why Pauli exclusion principle is called exclusion principle?

How many electrons are present in all subshells (fully filled) with n + l = 5?

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Answers Key:

Generic 2

5 x 2 = 10

No. of radial nodes = n - I +1 = 5 - 3 - 1 = 1.

Similarities:
(i) Both have similar shape.
(ii) Both have same angular momentum = \(\sqrt{l(l+1)} \frac{h}{2\pi}\)
Dissimilarities:
(i) Is orbital has no node while 2s orbital has one node.
(ii) Energy of 2s orbital is greater than Is orbital.
(iii) The size of the 2s orbital is larger than Is orbital.

0.529 \(\overset { o }{ A } \), Bohr radius.

This is because, according to this principle, if one electron of an atom has same particular values, for the four quantum numbers, then all the other electrons in that atom are excluded from having the same set of values.

Subshells with n + 1 = 5 are 5s, 4p, 3d. Hence electrons present are 2 + 6 + 10 = 18.