Atom
The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons).
Chemical changes
Processes or events that have altered the fundamental structure of something.
Electron
One of the parts of the atom having a negative charge. Indivisible particle with a charge of -1.
Element
Substance consisting of only one type of atom.
Particle
Small portion of matter.
Solution
Mixture of a solid and a liquid where the solid never settles out, for example, saltwater.