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3 Tutorials that teach Isotopes
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Isotopes

Isotopes

 
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Author: Nathan Lampson
Objective:

This lesson will introduce isotopes, and explain how they differ from other elements. It will also show that some isotopes are unstable and emit particles and/or radiation.

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Tutorial

Atoms of specific elements have a fixed number of protons and electrons, however, they can have different amounts of neutrons. When atoms have an uncommon number of neutrons, they are called isotopes. Isotopes that are unstable can emit radiation.

Example:

An atom of helium most commonly has 2 protons, 2 electrons, and 2 neutrons. Each proton and neutron has a mass of 1amu. If you add the mass of 2 protons and 2 neutrons you can identify that helium usually has a mass of 4amu.

When helium has a mass of 3amu it has fewer neutrons than usual. Since helium atoms always have 2 protons, the helium-3 isotope of helium has 1 neutron.

Questions and Answers

  • Answers 0
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    Maryjane Barber-Utley 23 days ago

    Elements do not have fixed number of electrons....they can ionize and acquire a charge

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SOPHIA has reviewed the tutorial and found it academically sound.
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