In the quantum mechanical treatment of the hydrogen atom, which one of the following combinations of quantum numbers is not allowed?
A. 3, 1, -1
B. 3, 2, 2
C. 3, 2, -1
D. 3, 3, 2
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“Each electron in an atom must have its own unique set of quantum numbers” is a statement of
A. Aufbau principle
B. Pauli exclusion principle
C. Hund’s rule
D. Periodic law
All of the following statements are correct for atomic structure and quantum numbers except
A. In a given atom, the maximum number of electrons having principal quantum
number n = 3, is 18
B. The number of orbitals in a given f subshell is 7
C. For n=4, the largest possible value of I is 3
D. For n=4, the largest possible value of mI is 2
In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: -5.92; -4.44; -2.96; -8.88. The units are arbitrary. What is the likely value of the electronic charge in these arbitrary units?
A. -1.11
B. -1.48
C. -2.22
D. -2.96
The effective nuclear charge for an atom is less than the actual nuclear charge due to
A. Shielding
B. Penetration
C. Paramagnetism
D. Electron-pair repulsion
What is the most common treatment for acrophobia?
A. Medication
B. Therapy
C. Hypnotherapy
D. Exposure therapy
There are 40 students in a class. If 5% are absent on Monday, calculate the number of the present students.
A. 2
B. 22
C. 32
D. 38
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