3 Written Questions

1. the very small center core of an atom
2. have no charge and are found in the nucleus
3. move rapidly around the nucleus and have a negative charge

3 Multiple Choice Questions

1. the sum of the protons and neutrons in the nucleus of an atom
   1. mass number
   2. atomic number
   3. model
   4. isotopes
2. atoms with the same number of protons and a different number of neutrons
   1. isotopes
   2. model
   3. neutrons
   4. protons
3. may be a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world.
   1. protons
   2. nucleus
   3. model
   4. isotopes

2 True/False Questions

1. atomic number → the sum of the protons and neutrons in the nucleus of an atom

   True        False

2. protons → have a positive charge and are in the nucleus

   True        False