2: Atoms and the Periodic Table
- Page ID
- 258830
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- 2.1: Atomic Theory
- Atoms are the ultimate building blocks of all matter. The modern atomic theory establishes the concepts of atoms and how they compose matter.
- 2.2: Elements and Atomic Number
- Atoms are composed of three main subatomic particles: protons, neutrons, and electrons. Protons and neutrons are grouped together in the nucleus of an atom, while electrons orbit about the nucleus.
- 2.3: Isotopes and Atomic Weight
- Elements can be identified by their atomic number and mass number. Isotopes are atoms of the same element that have different masses. Atoms have a mass that is based largely on the number of protons and neutrons in their nucleus.
- 2.4: The Periodic Table
- The chemical elements are arranged in a chart called the periodic table. Some characteristics of the elements are related to their position on the periodic table.
- 2.6: Electronic Structure of Atoms
- Electrons are organized into shells and subshells about the nucleus of an atom.