Answer:
The correct answer is "empirical and structural".
Step-by-step explanation:
The missing options of this question are:
(1) fission and fusion
(2) oxidation and reduction
(3) empirical and structural
(4) endothermic and exothermic
The correct answer is option (3) "empirical and structural".
The chemical formulas can be represented in three different ways: empirical, molecular and structural. The empirical chemical formulas are the simplest and only show the whole-number ratio of atoms in a compound. On the other hand, structural chemical formulas show the disposition of the atoms and at what positions they are bonded.