This is a type of subatomic particle. Subatomic
means “smaller than an atom.” Atoms are made up of protons, neutrons and
electrons. Protons and neutrons are made of even smaller particles called
quarks. Based on the evidence available today, physicists think that quarks are
elementary particles. That means they aren’t made up of anything else.
Protons have a positive electric charge. Electrons
have a negative electric charge. Quarks have just a fraction of a positive or
negative charge. Scientists have identified six different types, or “flavors,”
of quarks. These flavors are up, down, charm, strange, top and bottom. They
vary in their charge and mass. Down, strange and bottom are negatively charged,
and up, charm and top are positively charged. Particles that contain quarks,
like protons and neutrons, are known as hadrons.