Which of the following elements will most likely form a positive ion?

Hint: think Me+als and Non - metals

• Oxygen

• Chlorine

• Sodium

• Sulfur

What is the charge on a sodium ion?

The sodium atom has the electron configuration of 2.8.1

• +1

• +2

• -1

• -2

Which of these compounds is correctly named?

• NaCl - Sodium chloride

• MgO - Magnesium chloride

• K2O - Potassium oxide

• CaCl2 - Calcium oxide

In the compound Al2O3, what is the ratio of aluminium ions to oxide ions?

• 1:2

• 2:3

• 3:2

• 1:1

What type of bond is present in sodium chloride?

(Metal bonding to a non-metal)

• Covalent bond

• Metallic bond

• Ionic bond

• Hydrogen bond

Which property is typical of ionic compounds?

• High melting points

• Poor electrical conductivity in solid state

• Low boiling points

• Solubility in non-polar solvents

Why do ionic substances conduct electricity when molten but not when solid?

• Ions are fixed in place in the solid state.

• Ions move freely in the solid state.

• Electrons move freely in the solid state.

• Ions move freely when molten.

Metallic bonding is best described as:

• A lattice of positive ions surrounded by a sea of delocalised electrons.

• A lattice of negative ions surrounded by a sea of delocalised electrons.

• A lattice of neutral atoms with shared electrons.

• A lattice of positive ions held together by covalent bonds.

Which property of metals can be explained by metallic bonding?

• Brittle nature

• High electrical conductivity

• Low melting point

• Poor thermal conductivity

Which of these is a simple molecular compound?

(Max loves molecules because he can count them!)

• Diamond

• Sodium chloride

• Water

• Magnesium oxide