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Section 2: Quantum Theory and the Atom

Quantum Theory and the Atom

1.
What is the maximum number of electrons that can be present in each principal energy level of hydrogen?

Hydrogen’s First Four Principal Energy Levels
Principal quantum number( n)
Sublevels (types of orbitals) present
Number oforbitals related to sublevel

Total number
of orbitals related to principal energy level
(n2)
1
s
1
1
2
s
p
1
3
4
3
s
p
d
135
9
4
s
p
d
f
1
3
5
7
16


A)n
B)n2
C)2n
D)2n2
2.
The Heisenberg uncertainty principle states that ____________.
A)no two electrons in the same atom can have the same set of four quantum numbers
B)two atoms of the same element must have the same number of protons
C)it is impossible to simultaneously know the precise position and velocity of a particle
D)electrons of atoms in their ground states enter energetically equivalent sets of orbitals singly before they pair up in any orbital of the set
3.
What is the lowest energy state of an atom called?
A)the ground state
B)the excited state
C)the solid state
D)the chaotic state
4.
The ground state of hydrogen corresponds to the _________.
A)zeroeth energy level
B)first energy level
C)second energy level
D)highest energy level
5.
The concept that all moving particles have wave characteristics is attributed to ___________.
A)de Broglie
B)Thomson
C)Heisenberg
D)Bohr
6.
In the periodic table, the principal quantum number corresponds to the ________.
A)group number
B)period number
C)lanthanides
D)transition metals
7.
How many types of orbitals are present in atoms of elements in the third period of the periodic table?
A)1
B)2
C)3
D)4
8.
Which of the following statements is true?
A)Each set of d orbitals contains seven orbitals.
B)Each set of d orbitals can hold a maximum of 14 electrons.
C)The first energy level contains only s and p orbitals.
D)All s orbitals are spherically shaped.
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