3h44m40s18f Isotopes - Most are Stable but Some are Radioactive - TR2016a
Channel: Thorium Remix
Date: 2017-05-13

http://ThoriumRemix.com/ If you're an atom and you have just one proton- You're hydrogen.
2 protons- helium.
3- lithium.
All the way to 92 protons- in which case your name is uranium.
For any given element, the number of protons must remain the same. But the number of neutrons may vary. The atomic weight of an atom is the number of protons plus the number of neutrons. Natural uranium may contain 142, 143 or 146 neutrons. That means- Uranium has 3 natural isotopes. U-234, U-235, and U-238. Some elements, such as tin, have a great number of natural isotopes. Others, such as aluminum, have only 1. Most isotopes are stable. They would never spontaneously change their atomic structure. But some isotopes are constantly changing. They're busy being radioactive.

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