Using the diagram to guide your answer, which of the following statements are true? Choose all that apply. I The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen
The products (final) contain two atoms of nitrogen and six atoms of hydrogen
I The number of atoms is the same in the initial and final boxes
2 molecules of nitrogen react with 3 molecules of hydrogen to produce 2 molecules of ammonia
The number of molecules is the same in the initial and final boxes

The reactants (initial) contain 6 atoms of hydrogen and 2 atoms of nitrogen

The products (final) contain two atoms of nitrogen and six atoms of hydrogen

The number of atoms is the same in the initial and final boxes

Explanation:

Atom is the smallest unit of an element which may or may not exist independently.

Molecule is the smallest unit of a pure substance that consists of two or more atoms held together by a chemical bond .

Molecule of a Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example:  

Molecule of an element is a pure substance formed by combination of same types of atoms bonded by a chemical bond. Example: and

Here one molecule of nitrogen () combines with 3 molecules of hydrogen () to give 2 molecules of ammonia. ().