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Unknown Type
Purdue University

Purdue University: Fundamental Subatomic Particles

For Students 9th - 10th
At this site from the Purdue University, the elementary subatomic particles are described and electromagnetic radiation is detailed. Includes learning exercises and answers.
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Handout
Encyclopedia Britannica

Encyclopedia Britannica: Hydrogen Ion

For Students 9th - 10th
This brief entry describes the hydrogen ion, strictly, as the nucleus of a hydrogen atom separated from its accompanying electron. The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton.
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PPT
Sophia Learning

Sophia: Subatomic Particles: The Neutron: Lesson 2

For Students 9th - 10th
This lesson will explain that neutrons are particles in the nucleus that have no charge and a mass of one amu. It is 2 of 3 in the series titled "Subatomic Particles: The Neutron."