Science Atoms and Molecules

Which of the following is not true regarding chemical bonds?

• chemical bonds form compounds that are less stable than the individual atoms involved

• chemical bonds can form when atoms gain or lose electrons

• chemical bonds can form when atoms share electrons

• chemical bonds can form when electrostatic attractions hold atoms together

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WHich of the following is not a a reason that polar bonds form?

• polar bonds form because some atoms have different electronegativities

• polar bonds form because atoms of the same element have equal electronegativities

• polar bonds form because some atoms share electrons unequally

• all of the above are reasons that polar bonds

The octet rule states that atoms are generally most stable when

• eight atoms form ring-shaped molecules

• they combine with other elements to form compounds

• they have eight electrons in their valence energy level

• they lose all their valence electrons

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Which of the following best describes metallic bonds?

• metal atoms attracting their sea of shared electrons

• metal molecules having an unequal distribution of electric charge

• two metal atoms sharing electrons in order to become stable

• two metals with opposite electrical charges attaracting each other

The octet rule can be satisfied when an atom

• shares electrons

• gains enough electrons to have a full octet in its valence energy level

• loses enough electrons to expose the full octet of the next lower energy level

• undergoes any of the above

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A chemical bonds between two nonmetals with similar electronegativity would likely be what type of bond?

• covalent

• ionic

• metallic

• nonpolar

The electronegativities of the elements in an ionic bond tend to be what?

• equal

• similar and high

• similar and low

• very different

Two atoms that share electrons form what type of bond?

• covalent

• ionic

• metallic

• polar

Which atom is most likely to take valence electrons in ionic bonding?

• an atom found in diatomic molecules

• an atom found in polar molecules

• an atom with high electronegativity

• an atom with low electronegativity

Refer to a periodic table What ratio of atoms (ions) would you expect to find in potassium sulfide?

• one atom of potassium for every two atoms of sulfur

• one atom of potassium for every three atoms of sulfur

• two atoms of potassium for every one atom of sulfur

• three atoms of potassium for every one atom of sulfur

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