Natural Science CLEP Prep Practice Exam

What is the energy derived by chemical reactions in a living organism called?

1. Charge

2. Surface area

3. Compound

4. Valence

The correct answer is: Valence

Valence is the term used to describe the difference between the inner and outer shells of an atom. The inner shell is made up of the innermost electrons, which have a lower energy level, while the outer shell contains the outermost electrons, which are at a higher energy level. The difference between these two energy levels is known as the atom's valence. Option A, charge, is incorrect because while the difference in charge between the two shells does play a role, it is not the defining factor. Option B, surface area, is also incorrect as it does not accurately describe the difference between the shells of an atom. Option C, compound, is incorrect because compounds are formed when atoms of different elements interact with each other, not based on the difference between their inner and outer shells. Overall, valence is the most appropriate term for the difference between the inner and outer shells of an atom