In this article, we’ll look in more detail at the periodic table, how atoms organize their electrons, and how this allows us to predict the reactivity of elements.

Explore systematic variations across the periodic table, including atomic radius, ionization energy, electron affinity, and electronegativity. Show how these trends reflect underlying atomic …

Check your understanding of the structure of the periodic table in this set of free, standards-aligned practice questions.

Explore modern theories that describe atomic structure through various models, such as the Bohr model and the quantum mechanical model. Learn about the benefits and limitations of each …

Unit 1: Atoms, compounds, and ions Introduction to the atom History of atomic structure Quantum numbers and orbitals Electron configurations Introduction to the periodic table Periodic table …

Atomic structure Learn about the three subatomic particles that make up atoms: protons, neutrons, and electrons. Understand how these particles are represented on the periodic table.

Check your understanding of atomic structure and electron configuration in this set of free practice questions designed for AP Chemistry students.

The periodic table organizes all known elements by atomic number, displaying them in rows and columns called periods and groups. Each element’s square includes its symbol, atomic …

Explore atomic structure, the periodic table, stoichiometry, acids and bases, thermodynamics, nuclear chemistry and more. This course is aligned to the high school Texas Essential …

Practice Up next for you: Structure of an atom Get 4 of 5 questions to level up!