Isotopes and Elements

• All atoms of the same element have the same number of protons
• neutral atoms have the same number of electrons and protons
• What are isotopes?

  Atoms of the same element, but with different masses, which have the same number of protons but different number of neutrons
• What is an example of an isotope?

  Carbon-12, Carbon-13 and carbon-14
• What is the top number in an element?

  Mass number - number of neutrons and protons
• What is the bottom number in an element?

  Proton number