Chapter 18 Test
1. The nucleus of an atomA accounts for almost all of the mass of an atom
B contains both protons and electrons
C is negatively charged
2. Which of the following groups contains members with similar chemical
reactivity?
A Li, Be, C
B C, N, O
C Be, Mg, Sr
3. The table lists properties of some elements. Which element would you expect to
be in group 18 of the periodic table?
A carbon
B neon
C chlorine
Chapter 18 Test
4. According to the periodic table, which element most readily accepts electrons?
A* Fluorine
B Arsenic
C Nitrogen
5. An unidentified element has many of the same physical and chemical properties
as magnesium and strontium but has a lower atomic mass than either of these
elements. What is the most likely identity of this element?
A Na
B Ca
C* Be
6. What type of nuclear decay is represented in this illustration?
A beta decay
B alpha decay
C gamma radiation
7. Elements in Group 16 of the periodic table usually —
A solidify at room temperature
B gain electrons when bonding
C act like metals
Chapter 18 Test
8. The picture shows a model of the element —
A fluorine
B oxygen
C* beryllium
9. The elements of which of these groups on the periodic table are most resistant to
forming compounds?



A Group 18
B Group 1
C Group 14
10. Which of the following represents an isotope of Carbon-14?
A

8
6
B
C

8
14
C
C

14
6
C
Chapter 18 Test
11. According to the graph, what is the approximate half-life of carbon-14?
A 5.7 years
B* 5,700years
C 23,000 years
12. According to the periodic table, which of these elements will form an ion with a
–2 charge?
A S
B F
C Mg
13. Which of the following elements has the smallest atomic radius?
A Sulfur
B Aluminum
C Chlorine
14. How many protons are in an atom of Cobalt-60?
A 60
B 27
C 33
Chapter 18 Test
15. List the first three types of radioactive decay by the isotope below?
133
56
131
54
131
53
0
1
129
51
4
2
B Beta, Alpha, Beta
C Alpha, Beta, Alpha
16. Most metallic elements have all of these properties EXCEPT —
A a high melting point being
B a good conductor of electricity
C being easily crumbled into pieces
17. Which particle is located in the cloud region of the atom?
A Electron
B Nucleus
C Neutron
18. Which of the following is the correct notation for an ion of chlorine?
A

129
52
0
1
Ba Xe He I e Sb He Te e
A Alpha, Beta, Gamma

4
2
Cl 
B
Cl-
C

35
17
Cl
Chapter 18 Test
19. The table shows the atomic radii of some elements in Periods 1 through 4 of the
periodic table. Which inference can be made from this information?
A* Atomic radii decrease from left to right.
B Atomic radii increase from bottom to top.
C Atomic radii decrease from right to left.
20. Which of the following statements is correct for
A contains more protons than neutrons
B contains more electrons than protons
C contains more neutrons than electrons
?
Chapter 18 Test
Use the graph below to answer questions 21-22
21. The graph shows the amount of carbon-14 in tissue over time. According to the
graph, if a bone contains 1/8 the amount of carbon-14 that it did originally, its
approximate age is —
A 17,100 years
B 22,800 years
C
11,400 years
22. What type of nuclear decay is taking place in the graph?
A Alpha
B Beta
C Gamma
Chapter 18 Test
23. Elements found in which shaded area of this periodic table undergo the fewest
chemical reactions?
AS
B T
C Q
24. According to this information, which solid has an atomic mass greater than 200?
A Rb
B Cs
C Th
25. Dot diagrams are used to represent ______.
A the structure of the nucleus
B atomic number
C outer electrons