1) List the following sets of quantum numbers in order increasing energy: I . n=
ID: 1008105 • Letter: 1
Question
1) List the following sets of quantum numbers in order increasing energy:
I . n=4, / = 1, m/=1, ms = +1/2
II. n=3, /=2, m/= -1, ms = +1/2
III. n=4, / =0, m/ = 0, ms = +1/2
A) II < III < I
B) I < III < II
C) III < II < I
D) I < II < III
E) III < I < II
2) No two electrons in an atom can have the same four quantum numbers" is a statement of:
A) the Pauli exclusion principle
B) Bohr's equation
C) de Brogelie's reaction
D) Dalton's atomic theory
E) Hund's rule
3) For the elements Cs, F, and P, th order or increasing electronegativity is:
1) Cs < F < P
2) Cs < P < f
3) P < F < Cs
4) F < Cs < P
5) none of these
A) 1
B) 2
C) 3
D) 4
E) 5
Explanation / Answer
1. For (I), orbital is 4p, for (II), orbital is 3d and for (III), orbital is 4s. The increasing order of energy is 4s < 3d < 4p. Correct answer is III < II < I. (C) is answer.
2. This is the statement of Pauli's exclusion principle. All the electrons have different 4 quantum numbers. That means they can not have same n, l, m and s. Even if they are in same orbital, evrn then they will be of opposite spin, having different s value. Answer is A.
3. F is the most electronegative element in the periodic table. P lies in Nitrogen group and Cs is an alkali metal. So, Order is Cs < P < F. Answer is 3, means C.
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