Ionic and Covalent Bonds

Why do all bonds form?

• so the number of protons equals the number of electrons

• so an atom can become unstable

• to fill the outermost energy level

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An atom with 3 valence electrons "wants" a full shell, so it can either gain 5 or lose 3. Which is more likely to occur?

• Gain 5

• Lose 3

• Nothing

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How many Aluminum atoms are in Al₂O₃?

• 3

• 5

• 2

• 1

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How do covalent bonds form?

• By donating and receiving valence electrons between atoms.

• Scientists still aren't sure.

• Opposite slight charges attract each atom in the compound.

• Sharing valence electrons between atoms

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What two types of atoms make a covalent bond?

• 2 Nonmetals

• 1 Metal and 1 Nonmetal

• 2 Metals

• 2 Noble Gases

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When an atom loses an electron, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

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Ionic bonds are between...

• Metal and Non-metal
• Non-metal and Non-metal
• Metal and Metal

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Atoms are most stable when their outer shell is complete.

• true
• false

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How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons

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How are ionic bonds formed?

• Transfer of electrons
• Sharing of electrons

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