CHEM 210 MODULE 7 SCRIPT 2026
QUESTIONS AND SOLUTIONS
COMPREHENSIVE STUDY SHEET EXPERT
REVIEW
◉ True or false: Sharing valence electrons is one way atoms can
acquire the stable electron configuration of the noble gases.
Answer: True
> The octet rule says that atoms with a configuration of eight valence
electrons, like the noble gases, are stable. Atoms can achieve this
number of electrons through transferring or sharing them.
◉ Which forces act as two atoms approach each other?
Answer: a force of repulsion between each atom's electrons
a force of repulsion between each atom's protons
a force of attraction between one atom's protons and the other
atom's electrons
◉ The chemical bond that results from sharing valence electrons is
called a(n)
Answer: Covalent bond
,◉ Fluorine exists as a diatomic molecule because ______.
Answer: the sharing of one pair of electrons gives each fluorine atom
a stable noble-gas configuration
> Each fluorine atom has seven valence electrons. By sharing one
pair of electrons, forming a single bond, two fluorine atoms have
stable noble-gas configurations.
◉ Which are true of the single covalent bond in a hydrogen
molecule?
Answer: > The two shared electrons belong to each atom
simultaneously.
> Each hydrogen atom has the noble-gas configuration of helium
(1s2).
> Each covalently bonded atom equally attracts the pair of shared
electrons.
◉ Which are characteristics of covalent bonding?
Answer: > The majority of covalent bonds form between atoms of
nonmetallic elements.
> The shared electrons are considered to be part of the outer energy
levels of both atoms involved.
◉ Which is a model that uses electron-dot structures to show how
electrons are arranged in molecules?
,Answer: Lewis Structure
◉ Two fluorine atoms share electrons to form the diatomic molecule
F2 because the molecule ______.
Answer: is more stable than the individual atoms
◉ The halogens, which are the group 17 elements, tend to form a
______ covalent bond with atoms of other elements.
Answer: Single
◉ The most stable arrangement of atoms in a covalent bond exists at
some optimal distance between the two nuclei. At this point, the net
attraction is ______ than the net repulsion.
Answer: Greater
◉ Each fluorine atom in a fluorine molecule has ______ pair(s) of
electrons that are covalently bonded and ______ pair(s) of electrons
that are unbonded.
Answer: One; three
◉ Which bond is present in a hydrogen molecule (H2)?
Answer: a single covalent bond that results from the atoms sharing
one pair of electrons
, > Reason: A single bond is formed by atoms sharing one pair of
electrons, not two pairs.
> Reason: Double covalent bonds are formed by sharing two pairs of
electrons, not one. Hydrogen atoms cannot form double bonds.
> Reason: Two hydrogen atoms cannot share two pairs of electrons
(four electrons total) between them.
◉ Oxygen is a group 16 element. Water (H2O) is composed of two
hydrogen atoms and one oxygen atom. Each hydrogen atom has the
noble-gas configuration of _________ when it shares one electron in a
single covalent bond with oxygen. Oxygen has the noble-gas
configuration of __________ when it shares one electron with each
hydrogen atom. In total, the oxygen atom has ___________ single
covalent bonds.
Answer: Helium; neon; two
◉ A model that uses electron-dot structures to show how electrons
are arranged in molecules is called a ________. Lines or pairs of dots
between the element symbols represent ______ pairs of electrons.
Answer: Lewis structure; bonding/shared
◉ Atoms of group 17 elements form ______ covalent bonds with
atoms of other nonmetals.
Answer: Single
QUESTIONS AND SOLUTIONS
COMPREHENSIVE STUDY SHEET EXPERT
REVIEW
◉ True or false: Sharing valence electrons is one way atoms can
acquire the stable electron configuration of the noble gases.
Answer: True
> The octet rule says that atoms with a configuration of eight valence
electrons, like the noble gases, are stable. Atoms can achieve this
number of electrons through transferring or sharing them.
◉ Which forces act as two atoms approach each other?
Answer: a force of repulsion between each atom's electrons
a force of repulsion between each atom's protons
a force of attraction between one atom's protons and the other
atom's electrons
◉ The chemical bond that results from sharing valence electrons is
called a(n)
Answer: Covalent bond
,◉ Fluorine exists as a diatomic molecule because ______.
Answer: the sharing of one pair of electrons gives each fluorine atom
a stable noble-gas configuration
> Each fluorine atom has seven valence electrons. By sharing one
pair of electrons, forming a single bond, two fluorine atoms have
stable noble-gas configurations.
◉ Which are true of the single covalent bond in a hydrogen
molecule?
Answer: > The two shared electrons belong to each atom
simultaneously.
> Each hydrogen atom has the noble-gas configuration of helium
(1s2).
> Each covalently bonded atom equally attracts the pair of shared
electrons.
◉ Which are characteristics of covalent bonding?
Answer: > The majority of covalent bonds form between atoms of
nonmetallic elements.
> The shared electrons are considered to be part of the outer energy
levels of both atoms involved.
◉ Which is a model that uses electron-dot structures to show how
electrons are arranged in molecules?
,Answer: Lewis Structure
◉ Two fluorine atoms share electrons to form the diatomic molecule
F2 because the molecule ______.
Answer: is more stable than the individual atoms
◉ The halogens, which are the group 17 elements, tend to form a
______ covalent bond with atoms of other elements.
Answer: Single
◉ The most stable arrangement of atoms in a covalent bond exists at
some optimal distance between the two nuclei. At this point, the net
attraction is ______ than the net repulsion.
Answer: Greater
◉ Each fluorine atom in a fluorine molecule has ______ pair(s) of
electrons that are covalently bonded and ______ pair(s) of electrons
that are unbonded.
Answer: One; three
◉ Which bond is present in a hydrogen molecule (H2)?
Answer: a single covalent bond that results from the atoms sharing
one pair of electrons
, > Reason: A single bond is formed by atoms sharing one pair of
electrons, not two pairs.
> Reason: Double covalent bonds are formed by sharing two pairs of
electrons, not one. Hydrogen atoms cannot form double bonds.
> Reason: Two hydrogen atoms cannot share two pairs of electrons
(four electrons total) between them.
◉ Oxygen is a group 16 element. Water (H2O) is composed of two
hydrogen atoms and one oxygen atom. Each hydrogen atom has the
noble-gas configuration of _________ when it shares one electron in a
single covalent bond with oxygen. Oxygen has the noble-gas
configuration of __________ when it shares one electron with each
hydrogen atom. In total, the oxygen atom has ___________ single
covalent bonds.
Answer: Helium; neon; two
◉ A model that uses electron-dot structures to show how electrons
are arranged in molecules is called a ________. Lines or pairs of dots
between the element symbols represent ______ pairs of electrons.
Answer: Lewis structure; bonding/shared
◉ Atoms of group 17 elements form ______ covalent bonds with
atoms of other nonmetals.
Answer: Single
