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The answers are the substances found in the simple compounds of Hydrogen, ammonia, methane and water and when they will undergo melting or boiling, there are weak 'intermolecular forces' that break them which is the reason why it is not a strong covalent bond.

Answer;

Ionic substances

Single atoms

Explanation;

  • The two substances that do not contain molecules with covalent bonds are ionic substances and single atoms.
  • Ionic substances are those substances that are formed as a result of transfer of electrons from one atom to another, resulting to formation of ions or stable ions. Examples of such ions are sodium chloride, potassium iodide, etc. These compounds do not have molecules with covalent bonds.
  • Single atoms on the other hand do not have molecules with covalent bond since they exist as an atom and not as a molecule. They include elements such as magnesium, sodium,potassium, etc.

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