Detailed Summary
In this section, we explore the composition of molecules of elements, which are defined as groups of the same type of atoms. Some elements like helium (He) and argon (Ar) exist as monoatomic molecules, meaning they are composed of a single atom. In contrast, diatomic molecules consist of two atoms, such as oxygen (O2) and nitrogen (N2).
Atomicity
Atomicity refers to the number of atoms in a molecule. Notably, oxygen exists as O2, while ozone exists as O3. The section emphasizes the concept of atomicity in nonmetals and the variation in molecular structure among different elements.
Compounds and Their Molecules
Additionally, it defines how molecules of compounds are formed when atoms of different elements combine in specific proportions, such as in water (H2O) and ammonia (NH3). In this context, we also introduce the concept of ions and emphasize the fundamental differences in composition between elemental molecules and compound molecules. Understanding these concepts lays the groundwork for comprehending chemical reactions and formulas in later sections of this chapter.
