Atoms and Elements

• Neutron

  Relative charge: 0

  Relative mass: 1
• Isotopes

  Atoms of the same element with the same number of protons but different numbers of neutrons
• Most of the mass of an atom is located in the nucleus
• Atoms have no charge
• Atom of the element 88Sr

  • Number of neutrons: 50
• The relative atomic mass of chlorine is not a whole number
• Building a model of an atom

  1. Use a turnip with 20 cm radius as the nucleus

  2. Determine the radius of the whole atom