Focus On Physical Science: California Grade 8

Chapter 4: Understanding the Atom

Standards Review

1.
How does the mass of a proton compare to the mass of an electron? 3.a
A)The proton mass is about 200 times greater than the electron mass.
B)The proton mass is about the same as the electron mass.
C)The electron mass is about 2,000 times greater than the proton mass.
D)The proton mass is about 2,000 times greater than the electron mass.
2.
In the periodic table, elements in the same column have similar _______. 3.f
A)mass numbers
B)atomic numbers
C)chemical properties
D)radioactive properties
3.
All atoms of the same element have the same _______. 7.b
A)mass number
B)atomic number
C)number of ions
D)number of neutrons
4.
What was shown by Rutherford's gold foil experiments? 3.a
A)The nucleus of an atom is much smaller than the atom.
B)Positive charge is spread out evenly through the atom.
C)Most of the space in an atom is taken up by the nucleus.
D)Thomson's atomic model was correct.
5.
What is the atomic number of a nucleus? 7.b
A)the number of neutrons in the nucleus
B)the number of protons in the nucleus
C)the number of protons and neutrons in the nucleus
D)the number of atoms in the nucleus
6.
Which nucleus is an isotope of a nucleus containing 8 protons and 8 neutrons? 7.b
A)a nucleus with 10 protons and 6 neutrons
B)a nucleus with 10 protons and 8 neutrons
C)a nucleus with 6 protons and 10 neutrons
D)a nucleus with 8 protons and 10 neutrons
7.
How are elements arranged in a row on the periodic table of elements? 3.f
A)in order of increasing chemical properties
B)in order of increasing mass number
C)in order of increasing number of isotopes
D)in order of increasing atomic number
8.
What happens when an electron in a hydrogen atom goes from a higher energy level to a lower energy level? 3.a
A)Light with a single wavelength is absorbed.
B)Light with all wavelengths is given off.
C)Light with a single wavelength is given off.
D)Light with all wavelengths is absorbed.
9.
Which is the electric charge on a proton? 3.a
A)0
B)+1
C)-1
D)+2
10.
All ions of the same element have the ________. 7.b
A)same electric charge
B)number of electrons
C)number of protons
D)same mass number
11.
All isotopes of an element ________. 7.b
A)are radioactive
B)have the same mass number
C)have the same number of neutrons
D)have the same chemical properties
12.
What is true about an atom that is electrically neutral? 3.a
A)The number of protons and neutrons equals the number of electrons.
B)The number of protons equals the number of neutrons.
C)The number of neutrons equals the number of electrons.
D)The number of protons equals the number of electrons.
13.
How many electrons can be in the second energy level of an atom? 3.a
A)6
B)2
C)8
D)10
14.
Which best describes the current model for how electrons move in an atom? 3.a
A)They move in circular orbits that can be any diameter.
B)They can be anywhere in the electron cloud.
C)They move in circular orbits that can have only certain diameters.
D)They are mixed together with protons and neutrons.
15.
In most periodic tables, the block for each element usually includes the element's________. 7.b
A)symbol, wavelengths, chemical properties
B)symbol, isotopes, ions
C)name, physical properties, chemical properties
D)name, symbol, atomic number
Grade 8
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.