Isotopes - how to write and recognize - CHEM 101 Intro Chemistry

It's all about the neutrons here.

I love isotopes! Let's talk about what they are, and how to read and write them.

Isotope = a collection of atom(s) with a specific number of neutrons.
Isotopes = a set of atoms of the same element that can have a different number of neutrons.

0:00 Overview. Isotopes are atoms of the same element with a specific number of neutrons. (Or, the name of a Minor League Baseball team, the Albuquerque Isotopes!)
0:27 Review of an element tile
1:09 Carbon has two main isotopes on Earth: carbon-12 and carbon-13.
3:11 Isotope symbol template. A = mass number, Z = atomic number (protons), and N = neutron number (neutrons).
5:20 Carbon isotope symbol examples
6:14 Calculating neutrons. N = A - Z
6:41 Overview of example problems
6:57 Examples: Create isotope symbols for uranium-235, uranium-238, cesium-137, strontium-90, fluorine-18, technetium-99
10:34 Examples: Give A, Z, N for the isotopes hydrogen-1 (protium), hydrogen-2 (deuterium), hydrogen-3 (tritium), oxygen-16, oxygen-17, oxygen-18.
15:37 Final thoughts: isotopes vs. isobars (same Z different A, vs. different Z same A). This might help you get a concrete definition / idea of what is meant by "isotope" or "isotopes".