This video provides an introduction to chemistry, and covers some important features of the periodic table. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video defines the unit of mole using Avogadro's number, which is used to connect the mass of a substance to the number of its particles. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains how the unit of mole connects other units in Chemistry. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains mass spectrometry and how it is used to identify the isotopes of an element, interpreting the mass spectrum, relationship between the molar mass and average atomic mass, and the mass defect. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video covers a worked example on mass spectrometry. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video defines pure substances using several examples. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains the law of definite proportions for pure substances. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video defines the empirical formula for pure substances. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video covers a worked example on determining the percentage composition of each element in a pure substance. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video covers worked examples on finding the empirical or molecular formula of a compound in a pure substance. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains the composition of mixtures and formula units using several examples. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video covers worked examples on the composition of mixtures. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains Coulomb's law and the forces between charges in an atom using the simplified Bohr model. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains the types of shells, subshells and orbitals present in an atom at different energy levels. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains the shapes of s and p orbitals, which are obtained from quantum mechanics. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains Aufbau's rule, Pauli's exclusion principle and Hund's rule for determining the electron configuration of an atom. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video explains how to determine the electron configuration for an atom which is an exception to Aufbau's rule, using Chromium as an example. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Chemistry video covers worked examples on determining the electron configuration of an atom. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.