Biology 1107 MidTerm ExamWhat is the difference between a compound and a molecule?>>> Chemical bond = moleculecrystalline structure or atom by itself -- not a molecule1 A molecule consists of two more atoms, which can be the same or different types of atom, that are linked by a chemical bond. A molecule of H2 or O2 is still a molecule, but not a compound.2. A compound is usually a molecule as well. To be a compound, it has to have two different types of atoms, such as H2O.3. Some compounds like NaCl are not molecules because they are linked together in a crystalline structure, rather than being molecularly bonded.mass number>>> Mass number is the total number of protons and neutrons in the most common isotope of an atomatomic number>>> Atomic number is only the number of protons in the nucleus of the atom, giving the atom it's identity as a particular elementIdentify the four elements that make up 96% of living matter>>> CHNO -- Carbon, Hydrogen, Nitrogen, OxygenDraw and label a simplified model of an atom. Explain how this modelmisrepresents our understanding of atomic structure>>> The electrons don't actually