Georgia Science Grade 8

Chapter 3: Atoms, Elements,and the Periodic Table

CRCT Practice

1
The periodic table block lists properties of the element chlorine. What does the number 35.453 mean?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ag.jpg','popWin', 'width=281,height=252,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (24.0K)</a>
A)the number of neutrons and in every chlorine atom
B)the number of neutrons and protons in every chlorine atom
C)the average number of neutrons in a chlorine atom
D)the average number of neutrons and protons in a chlorine atom
2
According to the periodic table block, how many electrons does an uncharged atom of chlorine have?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ag.jpg','popWin', 'width=281,height=252,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (24.0K)</a>
A)17
B)18
C)35
D)36
3
Which of the following correctly identifies the three atoms shown in the illustration?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ah.jpg','popWin', 'width=369,height=189,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (15.0K)</a>
A)hydrogen, lithium, sodium
B)hydrogen, helium, lithium
C)hydrogen, helium, helium
D)hydrogen, hydrogen, hydrogen
4
What is the mass number for each of the atoms shown in the illustration?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ah.jpg','popWin', 'width=369,height=189,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (15.0K)</a>
A)0, 1, 2
B)1, 1, 1
C)1, 2, 2
D)1, 2, 3
5
Which of the following are found close to the right side of the periodic table?
A)metals
B)lanthanides
C)nonmetals
D)metalloids
6
Which of the following is a characteristic that is typical of a solid, nonmetal element?
A)shiny
B)brittle
C)good heat conductor
D)good electrical conductor
7
Which of the scientists below introduced the idea that matter is made up of tiny, individual bits called atoms?
A)Arrhenius
B)Avogadro
C)Chadwick
D)Democritus
8
The illustration shows atoms of an element and molecules of a compound that are combined evenly without making a new compound. What term describes a combination such as this?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ai.jpg','popWin', 'width=223,height=257,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (20.0K)</a>
A)substance
B)compound
C)heterogeneous mixture
D)homogeneous mixture
9
If the illustration showed only the element or only the compound, what term would describe it?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078778468/516570/ai.jpg','popWin', 'width=223,height=257,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (20.0K)</a>
A)substance
B)compound
C)heterogeneous mixture
D)homogeneous mixture
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Policy before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.