Multiple Choice QuestionsAssertion (A) : Atoms with completely filled and half-filled sub-shells are stable.
Reason (R): Completely filled and half-filled sub-shells have symmetrical distribution of electrons and have maximum exchange energy.
The correct answer is
(A) and (R) are correct, (R) is the correct explanation of (A)
(A) and (R) are correct, (R) is not the correct explanation of (A)
(A) is correct, but (R)is not correct
(A) is not correct, but (R) is correct
The quantum number of four electrons are given below:
| I. n = 4 | l = 2 | ml = -2 | ms = - |
| II. n = 3 | l = 2 | ml = 1 | ms = + |
| III. n = 4 | l = 1 | ml = 0 | ms = + |
| IV. n = 3 | l = 1 | ml = 1 | ms = - |
The correct order of these increasing energies will be:
IV > III > II > I
I > II > III > IV
I > III > II > IV
IV > II > III > I
The graph between Ψ2 and r(radial diatance) is shown beow . This represents
2s orbital
2p orbital
3s orbital
1s orbital
