topic C1 (atoms)

topic C1 (atoms)

1. atomic number and mass number describe an atom

   • atomic number is the number of protons
   • mass number is the number of protons + number of neutrons
   • number of neutrons is the mass number and the atomic number
   • element symbol is what the letters of what the metal is on the periodic table

2. isotopes are atoms with the same number of protons but a different number of neutrons

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