Atoms, Molecules, and Nuclear Chemistry CDS Questions

CDS Chemistry

Atoms, Molecules, and Nuclear Chemistry MCQ Questions


7.
The maximum number of electrons that can be accommodated in the nth shell of an atom is given by the formula:
A.
2n
B.
n^2
C.
2n^2
D.
n + 2
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ANSWER :
C. 2n^2
8.
The electronic configuration of sodium (atomic number 11) is:
A.
2, 8, 2
B.
8, 2, 1
C.
2, 8, 1
D.
2, 9
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ANSWER :
C. 2, 8, 1
9.
The atomic number of an element represents the number of:
A.
Protons present in its nucleus
B.
Electrons in its outermost shell only
C.
Neutrons present in its nucleus
D.
Total nucleons in its nucleus
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ANSWER :
A. Protons present in its nucleus
10.
The mass number of an atom is equal to the:
A.
Number of neutrons alone
B.
Sum of the number of electrons and neutrons
C.
Sum of the number of protons and neutrons
D.
Sum of the number of protons and electrons
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ANSWER :
C. Sum of the number of protons and neutrons
11.
Which of the following subatomic particles carries no electric charge?
A.
Electron
B.
Proton
C.
Positron
D.
Neutron
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ANSWER :
D. Neutron
12.
The principle which states that no two electrons in an atom can have an identical set of all four quantum numbers is called:
A.
Heisenberg's uncertainty principle
B.
Aufbau principle
C.
Hund's rule of maximum multiplicity
D.
Pauli's exclusion principle
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ANSWER :
D. Pauli's exclusion principle