The Periodic Table: Mass Number and Atomic Mass

The video tutorial explains the concept of atomic mass, focusing on subatomic particles like protons and neutrons. It introduces the atomic mass unit (AMU) as a measure for these particles. The tutorial details how to calculate the mass number by adding protons and neutrons, using carbon as an example. It also discusses isotopes, which are atoms of the same element with different neutron counts, affecting the atomic mass. The atomic mass is a weighted average of all isotopes, often resulting in a decimal value.

What are isotopes and how do they affect the atomic mass of an element?

Why is the atomic mass of carbon expressed as a decimal number?