Giant Covalent & Simple Molecular Structures

What do the elements with giant covalent lattice structures have?

Strong covalent bonds linking all their atoms together

What's needed to break these bonds?

A lot of energy

What do carbon and silicon have?

The highest meting and boiling points in their periods

What's the covalent bonds like in simple molecular structures?

Very strong

What do the melting and boiling points in simple molecular substances depend on?

The strength of the induced dipole-dipole forces between their molecules.

Why do simple molecular substances have low melting and boiling points?

The forces are weak and easily overcome.

What do more atoms in a molecule mean for simple molecular substances?

Stronger induced dipole-dipole forces.