Why do atoms form chemical bonds?

Describe the key difference between an ionic bond and a covalent bond in terms of electrons.

What type of bonding would you expect between a metal and a non-metal?

Draw a dot-and-cross diagram to show the ionic bonding in magnesium oxide, MgO. (Atomic numbers: Mg=12, O=8).

Draw a dot-and-cross diagram to show the covalent bonding in a methane molecule, CH₄. (Atomic numbers: C=6, H=1).

Explain why ionic compounds like NaCl have high melting points.

Why do covalent molecular substances like water generally have low boiling points?

Explain why solid sodium chloride does not conduct electricity, but a solution of sodium chloride in water does.

What is a double covalent bond? Give an example of a molecule that contains one.

What is an ion? Differentiate between a cation and an anion.

What holds the ions together in a giant ionic lattice?

Would you expect potassium bromide (KBr) to conduct electricity in its molten state? Explain.

What type of bonding exists between two non-metal atoms?

In the water molecule (H₂O), the oxygen atom has a slight negative charge. What is this phenomenon called?

Name the weak forces of attraction that exist between water molecules.