UR End of Year Revision

Elements on the LEFT side of the periodic table will most likely form:

• Positive ions
• Negative ions
• Neutral Ions
• None of these

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NGSS.HS-PS1-1

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

• + 2
•  - 2
• +1
• -1

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Covalent compounds

• Share electrons
• transfer electrons
• contain a sea of electrons
• conduct electricity

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Ionic bonding is between a

• nonmetal and nonmetal

• metal and nonmetal

• metal and metal

• Depends on the situation

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What is the chemical formula for Lithium Nitride?

• Li₃N

• LiN₃

• NLi₃

• N₃Li

Low melting and boiling points which increase with increasing molecule size due to increased intermolecular forces.

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Elements such as  Silicon, diamond and graphite.  Compounds include  SiO₂

• simple covalent molecules
• metallic
• ionic
• giant covalent 

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NGSS.HS-PS1-3

Melting points are very high – a large amount of energy is needed to break all the covalent bonds

• simple covalent molecules
• metallic
• ionic
• giant covalent 

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Formulae of these might include H₂O
each molecule contains 1 O and 2H atoms 

• simple covalent molecules
• metallic
• ionic
• giant covalent 

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NGSS.HS-PS1-3

Which of these is covalent?

• NaCl
• Pb(NO₃)₂
• CO₂
• AlCl₃

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NGSS.HS-PS1-1

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