the smallest part of an element
having to do with the atom
particles that hold protons and neutrons together
the neutral part of the atom on the inside of the atom
when the molecules break into smaller particles
small particles that make up protons and neutrons
a material formed by joining elements
number of protons in an element
holds the quarks together
matter made of one kind of material
the action when one atom joins with another to form a new substance
the middle of the atom
the number of protons and neutrons in the nucleus of the atom
the positive part of the atom on the inside of the atom
the negative part of the atom
energy levels where the electrons are found
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