1. An element's atomic number is determined by the (number of protons)(number of neutrons) in the nucleus. 2. An element's atomic weight is determined by adding the number of (protons, neutrons, and electrons)(protons and neutrons). 3. The number of electrons equals the number of (protons)(protons and neutrons added together). 4. Atoms are electrically (neutral)(positive). 5. The number of electron rings, or shells, (varies)(is the same) between atoms. 6. (All)(Some) isotopes of an element are unstable and emit radiation as they decay. 7. An element's unique chemical properties result from (the various combinations of protons, neutrons, and electrons)(the various types of protons, neutrons, and electrons making up the atoms of the element)