What is a pure substance that contains atoms of more than one element called

Explanation:

A compound is defined as a substance formed due to chemical combination of two different elements which are present in a fixed ratio by mass.

A compound is a pure substance as it can be broken down into its constituent elements.

For example, is a pure substance and it can be broken down into magnesium and chlorine ions.

Thus, we can conclude that a pure substance that contains atoms of more than one element called compound.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.