istinguish between ionic and molecular compounds in terms of the basic
units that each is composed of.

In molecular compound atoms are held together through covalent bond. It is formed between the non metals.

In ionic compounds positive and negative ions held together through electrostatic attraction. It is formed between metal and non metal.

Explanation:

Ionic compound:

In ionic compounds positive and negative ions held together through electrostatic attraction. It is formed between metal and non metal.

For example:

Sodium chloride is ionic compound. Te sodium metal lose it electron and this electron is accept by the chlorine atom. Sodium became positive ion while chlorine became negative ion. The forces develop between them are electrostatic forces.

Molecular compound:

In molecular compound atoms are held together through covalent bond. It is formed between the non metals.

For example:

Carbon dioxide is molecular compound. It is made up of carbon and oxygen atoms. Both atoms share the electrons with each other and form two double bond O=C=O.

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indium, and thallium have three electrons i think