_Models Useful for Understanding Atoms   Lesson 3.1

Key Concepts
  • Why are models useful for understanding atoms?

Key Terms
  • protons
  • neutrons
  • electrons
  • atomic number
  • isotopes
  • mass number
  • model
Models
  • Because atoms are so small, scientists create models to describe them.
  • In science, a model may be a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world.
   Uses for Models
  • These models are used to make and test predictions.
  • Models of atoms are used to explain why elements react with other elements.