Purdue University
Purdue University: Fundamental Subatomic Particles
At this site from the Purdue University, the elementary subatomic particles are described and electromagnetic radiation is detailed. Includes learning exercises and answers.
University of Cambridge
University of Cambridge: Physics: The Neutron
This site provides a great series on the neutron discovered by James Chadwick. Includes a seven-page series that covers what is inside the nucleus, the elusive neutron, beryllium radiation, Chadwick's discovery, neutrons from beryllium,...
BiologyWise
Biology Wise: Levels of Biological Organization
Describes the levels of organization in biology, from the subatomic particle up to the biosphere.
Symmetry Magazine
Symmetry Magazine: Explain It in 60 Seconds: The Terascale
The terascale, described in this article, is a subatomic region that requires enormous amounts of energy in order to reach it. Scientists hope to be able to study it with the Large Hadron Collider. "Explain It In 60 Seconds" is an...
OpenStax
Open Stax: Elements and Atoms, the Building Blocks of Matter
This site provides an overview of elements and atoms, the building blocks of matter.
BBC
Bbc: Gcse Bitesize: Atomic Structure
This lesson focuses on the structure of atoms. All substances are made from atoms. Each atom is made of a nucleus - containing protons and neutrons - surrounded by electrons. It provides a link to an assessment.
Science Struck
Science Struck: What Makes Up an Atom?
Describes the structure of an atom and the characteristics of the electrons, neutrons, and protons inside it. Includes some interesting facts about atoms.