UNIT 5 EXAM: Bonding

Why do elements bond?

• To be friends
• To create a new element
• To become stable

What is a valence electron?

• The sum of neutrons and protons.
• The # of electrons in the last shell.
• A type of bond.
• A popular compound.

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All but Hydrogen and Helium want how many valence electrons?

• 1

• 2

• 8

• 0

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Covalent Bonds ______________ valence electrons.

• give

• take

• keep

• share

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An ionic bond is formed when

• Valence electrons are shared.

• Valence electrons surround the cations.

• Valence electrons are transferred between atoms.

• Valence electrons are completely transferred between two metals.

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Cations are ions with _________ charge.

• positive

• negative

• gains

• loses

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

• nothing

• gain 7

• lose 1

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In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.

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The reason that Noble Gases do not react is because

• Their outer electron shell is filled

• Their inner electron shell is filled

• They are able to bond to fill their outer shell

• None of the above, Noble Gases are highly reactive

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If an atom gains two electrons what charge will it have?

• -2
• -1
• +1
• +2