Covalent bonding

• Define 'Covalent bond'

  When two atoms share a pair of electrons.
• Most covalently bonded structures consist of..

  Small molecules
• Define 'Molecule'

  A group of two or more atoms joined together by covalent bonds
• Molecules of the same element or compound contain..

  The same number of atoms in each element
• Covalent bonds share..

  Their outer shell electrons
• State how many covalent bonds each non-metal group forms

  Group 4 - 4 covalent bonds

  Group 5 - 3 covalent bonds

  Group 6 - 2 covalent bonds

  Group 7 - 1 covalent bond
• Why do simple molecules have low melting and boiling points?

  Their intermolecular forces are much weaker than the strong covalent bonds. Relatively little energy is needed to overcome the intermolecular forces, making them have low melting and boiling points.
• Describe the relation within the size of a molecule and their intermolecular forces.

  The bigger the molecule, the stronger the intermolecular forces.
• Why can't simple molecules conduct electricity?

  As they have no overall electrical charge