atomic structure

    Cards (4)

    • how do you calculate the number of neutrons?
      Atomic mass - Atomic number
    • what is an ion?
      gaining or losing an electron (results in a positive or negative charge)
    • what is an isotope?
      gain or lose neutrons but same number of protons
    • give facts about stars
      1. not homogenous
      2. pressure and temperature are highest in the core
      3. up to iron nuclear fusion can produce enough energy and pressure to overcome repulsion of protons
      4. after iron a super nova takes place to synthesise heavier elements
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