s8pe-207cr-ca
12/19/05
4:30 PM
MAZER
Page 231
13. The modern periodic table is organized by (8.7.c)
Reviewing Vocabulary
a. size of atom
Describe how the vocabulary terms in the
following pairs are related to each other.
Explain the relationship in a one- or
two-sentence answer. Underline each
vocabulary term in your answer.
1. isotope, nucleus
2. atomic mass, atomic number
b. atomic mass
c. number of neutrons
d. atomic number
14. Elements in a group have (8.7.c)
a. a wide range of chemical properties
b. the same atomic radius
c. similar chemical properties
3. electron, proton
d. the same number of protons
4. group, period
15. Elements in a period have (8.7.c)
a. a wide range of chemical properties
5. metals, nonmetals
6. radioactivity, half-life
b. the same atomic radius
c. similar chemical properties
7. density, hardness
d. the same number of protons
16. From left to right in a period, the size of atoms
Reviewing Key Concepts
(8.7.c)
a. increases
b. decreases
Multiple Choice Choose the letter of the
best answer.
8. The central part of an atom is called the
a. electron
c. proton
b. nucleus
d. neutron
(8.3.a)
9. The electric charge on a proton is (8.3.a)
a. positive
c. neutral
b. negative
d. changing
10. The number of protons in the nucleus is the
(8.7.b)
a. atomic mass
b. isotope
c. atomic number
d. half-life
11. Nitrogen’s atomic number is 7. An isotope of
nitrogen containing seven neutrons would be
(8.7.b)
a. nitrogen-13
b. nitrogen-14
c. nitrogen-15
d. nitrogen-16
12. How does the size of a negative ion compare
to the size of the atom that formed it? (8.3.a)
a. It’s smaller.
b. It’s larger.
c. It’s the same size.
d. It varies.
c. remains the same
d. shows no pattern
17. The elements in Group 1 of the periodic table
are commonly called the (8.7.c)
a. alkali metals
c. alkaline earth metals
b. transition metals
d. rare earth metals
18. The isotope nitrogen-13 has a half-life of 10
minutes. If you start with 40 grams of this
isotope, how many grams will you have left
after 20 minutes? (8.3.a)
a. 10
c. 20
b. 15
d. 30
Short Answer Write a short answer to
each question. You may need to consult
a periodic table.
19. Rubidium forms the ion Rb+. Is this ion larger or
smaller than the neutral atom? Explain. (8.3.a)
20. How can you find the number of neutrons in the
isotope nitrogen-16? (8.7.b)
21. Explain how density varies across and up and
down the periodic table. (8.7.c)
22. Place these elements in order from least reactive
to most reactive: nickel (Ni), xenon (Xe), lithium
(Li). How did you determine the order? (8.7.c)
Chapter 7: Atomic Structure and the Periodic Table 231
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