Introduction to the atom

1 article
5 videos
In chemistry, we will often be thinking about the world on a much smaller scale than you can see with the naked eye. Here we will learn about atoms and elements, tiny particles that make up the world around us. What are atoms, and what kind of properties do they have? How do we weigh and count atoms? We will answer those questions in this section!

Elements and atoms

VIDEO 13:09 minutes
How elements relate to atoms. The basics of how protons, electrons, and neutrons make up an atom.

Atomic number, mass number, and isotopes

VIDEO 9:44 minutes
How to use the atomic number and the mass number to represent different isotopes

Isotopes and mass spectrometry

Isotopes and atomic weight. How isotopes can be detected using mass spectrometry.

Atomic weight and atomic mass

VIDEO 8:54 minutes
The difference between atomic weight and atomic mass in chemistry, and how it compares to the physics definitions of weight and mass.

Atomic weight

VIDEO 9:49 minutes
An example of calculating atomic weight using the atomic masses of the isotopes.

The mole and Avogadro's number

VIDEO 9:44 minutes
Introduction to the idea of a mole as a number (vs. an animal).