One page editable worksheet can be used as a preview, review, assessment, etc.

Define-Matter, Atom, Nucleus, Proton, Neutron, Electron, Spectral Line, Energy Level, Electron Cloud, Element, Atomic Number, Mass Number, Isotope, Average Atomic Mass, Ion.

Understanding Concepts

1) Illustrate an atom. Include protons, electrons, and neutrons.

2) Compare the mass, location, and charge of the three basic particles of an atom.

3) List Dalton’s three observations.

4) Illustrate Thomson’s, Rutherford’s, and Bohr’s models of the atom.

5) How do elements differ?

6) How do two isotopes differ?

7) How do two ions differ?

8) How many protons and electrons does potassium have?

Answer Key Included.