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Name ______________________________________ Date ____________ Class _______________________
Modern Chemistry • CHAPTER 4
HOMEWORK 4-4
(pp. 101–104)
VOCABULARY
1. What are quantum numbers? _______________________________________________________
_______________________________________________________________________________
Fill in the chart to show what each quantum number indicates.
Quantum Number
Symbol
What Number Indicates
Principal quantum number
Angular momentum number
Magnetic quantum number
2. What does the spin quantum number indicate? _________________________________________
_______________________________________________________________________________
GRAPHIC ORGANIZER
Complete the chart by illustrating each orbital notation.
Orbital Notation
Illustration
s orbital
px orbital
dyz orbital
dxy orbital
pz orbital
STANDARDIZED TEST PREP
Circle the letter of the best answer.
1. Which of the following indicates the s sublevel in the third main energy level?
a. s3
b. 3xyz
c. s3
d. 3s
2. Which of the following statements is true?
a. A single orbital holds at least two electrons.
b. The total number of orbitals at a main energy level increases as n increases.
c. The number of orbitals at each main energy level is twice the principal quantum number.
d. As n increases, the electron’s energy increases and its average distance from the nucleus decreases.
Modern Chemistry
Copyright © by Holt, Rinehart and Winston. All rights reserved.
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CHAPTER 4
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• HOMEWORK 4-4
VOCABULARY
1. Quantum numbers indicate the energy, location, shape, and orientation of atomic orbitals, as well
as the spins of atomic orbitals.
Quantum Number
Symbol
What Number Indicates
Principal quantum number
n
the main energy level occupied by the electron
Angular momentum number
l
the shape of the orbital
Magnetic quantum number
m
the orientation of an orbital around the nucleus
2. the two fundamental spin states of an electron in an orbital
GRAPHIC ORGANIZER
Students’ drawings should match information in Figures 4-13, 4-14, and 4-15.
STANDARDIZED TEST PREP
1. d
2. b
CHAPTER 4
• HOMEWORK 4-5
VOCABULARY
1. An electron occupies the lowest-energy orbital that can receive it.
2. the arrangement of electrons in an atom
3. No two electrons in the same atom can have the same set of four quantum numbers.
4. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second
electron, and all electrons in singly occupied orbitals must have the same spin.
SKILL BUILDING
1. Each of the first four boxes will show one arrow pointing up.
2. The first three boxes show up and down arrows. The last two boxes show only up arrows.
3. 14; The figure will show seven boxes, each with an up and a down arrow.
STANDARDIZED TEST PREP
1. a
2. c