Indiana Science Grade 8

Chapter 6: Atomic Structure and Chemical Bonds

Chemical Bonds

1.
The ions in ionic compounds are held together by __________.
A)ionic bonds
B)covalent bonds
C)unequal sharing of electrons
D)equal sharing of electrons
2.
A(n) __________ is a force that holds two atoms together.
A)chemical compound
B)ion
C)chemical bond
D)isotope
3.
A chlorine atom has 17 protons and 18 neutrons. How many electrons does it have?
A)18
B)1
C)35
D)17
4.
The first version of the periodic table of the elements was created by __________.
A)Mendeleev
B)Mendel
C)Minsk
D)Mendelssohn
5.
A double bond is one in which __________.
A)two atoms are joined by sharing electrons
B)atoms share two pairs of electrons
C)three pairs of electrons are shared
D)an atom loses two pairs of electrons to another atom
6.
Most of an atom's mass is contained in __________.
A)its outer energy shell
B)the electron orbits
C)the electron cloud
D)its nucleus
7.
A(n) __________ is a bond in which electrons are shared unequally.
A)nonpolar
B)polar bond
C)ionic
D)intermediate
8.
Based on what you know about sodium chloride, which of the following elements would you expect to form an ionic salt?
A)sodium and carbon
B)sodium and phosphorus
C)potassium and nitrogen
D)potassium and iodine
9.
What do lithium, sodium, and potassium have in common?
A)They are all Group I elements.
B)They all have two electrons in their outer energy levels.
C)They are all nonmetals.
D)They are all metalloids.
10.
What is one difference between satellites and electrons?
A)Satellites have positive electrical charges. Electrons have negative charges.
B)You can calculate exactly where an electron will be at any time. A satellite's position must be estimated.
C)Satellites have a larger negative charge than electrons.
D)You can calculate exactly where a satellite will be at any time. An electron's position must be estimated.
11.
A(n) __________ is a pure substance that contains two or more elements.
A)solution
B)ion
C)compound
D)molecule
12.
Nonpolar molecules do not have __________.
A)double bonds
B)triple bonds
C)covalent bonds
D)unbalanced charges
13.
The __________ an energy level is from the nucleus, the __________ electrons it can hold.
A)farther, fewer
B)closer, more
C)farther, more
D)farther, more tightly bound
14.
Which of the following is NOT true of the elements in Group 18?
A)They are all nonmetals.
B)Their outer energy levels are complete.
C)They include the noble gases.
D)They are all metalloids.
15.
A(n) __________ is a method of representing atoms and the electrons in their outer energy levels.
A)electron dot diagram
B)chemical formula
C)chemical symbol
D)chemical equation
16.
How many electrons does an atom of carbon have in its outer energy level?
A)6
B)12
C)4
D)8
17.
A(n) __________ is formed between atoms when they share electrons.
A)ionic bond
B)electrical bond
C)salt
D)covalent bond
18.
The atomic number of calcium is 20. How many protons does a calcium atom contain?
A)10
B)40
C)20
D)0
19.
Electrons in the sphere closest to the nucleus are in the __________ energy level.
A)middle
B)negative
C)highest
D)lowest
20.
A ________ is a combination of chemical symbols indicating what elements are present in a molecule.
A)chemical equation
B)chemical formula
C)superscript
D)subscript
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