Chemistry

Chemistry

1. structure of the atom

   • Found in nucleus
     • Protons
       • Relative charge: +1
       • Relative mass: 1
     • Neutrons
       • Relative charge: 0
       • Relative mass: 1
   • Found in shells
     • Electrons
       • Relative mass: 1/1850
       • Relative charge: -1
   • Atomic number
     • Number of protons in the nucleus
   • Mass number
     • Total number of protons and neutrons in the nucleus

2. Periodic table

   • Metals on left side
   • Non-metals on right side

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