3 Written questions
3 Multiple choice questions
- may be a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world.
- atoms with the same number of protons and a different number of neutrons
- have a positive charge and are in the nucleus
2 True/False questions
atomic number → the sum of the protons and neutrons in the nucleus of an atom
nucleus → the very small center core of an atom