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Chemical Bonding

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Chapter 13

CRCT Preparation


Chapter 13 CRCT Preparation

1. How many electrons are in the second energy level of the atom shown?

A 2

B 7

C 8

D 9



1. How many electrons are in the second energy level of the atom shown?

A 2

B 7

C 8

D 9



2. Which of the following statements about helium atoms is true?

A Helium atoms can never have a full set of valence electrons.

B Helium atoms need only 2 valence electrons to have a full outermost energy level.

C Helium atoms do not have valence electrons.

D Helium atoms have the same number of valence electrons as sulfur atoms do.



2. Which of the following statements about helium atoms is true?

A Helium atoms can never have a full set of valence electrons.

B Helium atoms need only 2 valence electrons to have a full outermost energy level.

C Helium atoms do not have valence electrons.

D Helium atoms have the same number of valence electrons as sulfur atoms do.


3. Sodium chloride, or table salt, forms when a chlorine atom takes an electron from a neighboring sodium atom. Which of the following describes the force that holds sodium chloride together?

A an ionic bond

B a hydrogen bond

C a metallic bond

D a covalent bond




3. Sodium chloride, or table salt, forms when a chlorine atom takes an electron from a neighboring sodium atom. Which of the following describes the force that holds sodium chloride together?

A an ionic bond

B a hydrogen bond

C a metallic bond

D a covalent bond


4. An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of an aluminum ion?

A 10 –

B 3 –

C 1 +

D 3 +




4. An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of an aluminum ion?

A 10 –

B 3 –

C 1 +

D 3 +


5. What property of copper allows copper wire to bend without breaking?

A Copper atoms have 29 protons.

B Copper is found in Group 11 on the periodic table.

C Copper atoms do not have a full outermost energy level.

D Copper atoms form metallic bonds with each other.




5. What property of copper allows copper wire to bend without breaking?

A Copper atoms have 29 protons.

B Copper is found in Group 11 on the periodic table.

C Copper atoms do not have a full outermost energy level.

D Copper atoms form metallic bonds with each other.



6. According to the electron-dot diagram of oxygen shown, how many more valence electrons does the oxygen atom need to fill its outermost energy level?

A 1

B 2

C 6

D 8



6. According to the electron-dot diagram of oxygen shown, how many more valence electrons does the oxygen atom need to fill its outermost energy level?

A 1

B 2

C 6

D 8


7. The ions that make up an ionic compound are bonded in a repeating three-dimensional pattern. What is this pattern called?

A chloride lattice

B covalent bond

C crystal lattice

D crystal pattern




7. The ions that make up an ionic compound are bonded in a repeating three-dimensional pattern. What is this pattern called?

A chloride lattice

B covalent bond

C crystal lattice

D crystal pattern


8. Which of the following forms when a neutral atom loses an electron?

A a negative atom

B a neutral ion

C a positive ion

D a negative ion




8. Which of the following forms when a neutral atom loses an electron?

A a negative atom

B a neutral ion

C a positive ion

D a negative ion


9. During a laboratory experiment at Georgia State University, Juanita observes a model of two bonded atoms. She is told that the atoms are both nonmetals. Which of the following is a valid conclusion?

A She is looking at a model of atoms held together by a covalent bond.

B She is looking at a model of atoms held together by an ionic bond.

C She is looking at a model of a metalloid.

D She is looking at a model of a crystal lattice.




9. During a laboratory experiment at Georgia State University, Juanita observes a model of two bonded atoms. She is told that the atoms are both nonmetals. Which of the following is a valid conclusion?

A She is looking at a model of atoms held together by a covalent bond.

B She is looking at a model of atoms held together by an ionic bond.

C She is looking at a model of a metalloid.

D She is looking at a model of a crystal lattice.


10. Which of an atom’s electrons are most likely to be involved in chemical bonding? Why?



10. Answer - Full-credit answers should include the following points:

• The valence electrons are most likely to be involved in chemical bonding.

• When two atoms are close to each other, the outermost electrons of one atom are closest to the nucleus of the other atom.

• The attraction between the outermost electrons in one atom and the positively-charged nucleus of the other atom contributes to the bond between the two atoms.

• The outermost electrons are shared, lost, or gained most easily.



11. Why do atoms of the noble gases, in Group 18 on the periodic table, usually not form chemical bonds?



11. Answer - Full-credit answers should include the following points:

• The number of electrons in the outermost energy level of an atom determines whether an atom will form bonds.

• Atoms of the noble gases (Group 18) do not usually form chemical bonds because each atom has a full set of valence electrons.

• When the outermost energy level of an atom is full, the atom does not usually form bonds.
