Represent the molecule `H_2O` using Lewis notation. 

Explain the formation of Methane molecule by using Lewis notation.

Explain the formation of Ammonia molecule by using Lewis notation.

Represent each of the following atoms using Lewis notation. Calcium

Represent each of the following atoms using Lewis notation. Lithium

Represent each of the following atoms using Lewis notation. Beryllium

Represent each of the following atoms using Lewis notation. Calcium chloride (CaCl_2)

Represent each of the following atoms using Lewis notation. Bromine gas (Br_2)

Represent each of the following atoms using Lewis notation. Carbon dioxide (CO_2)

A chemical compound has the following Lewis notation: How many covalent bonds are there in the molecule?

Which chemical compound has the following Lewis notation : How many covalent bonds are there in the molecule ?