1_Chemistry Revision

1_Chemistry Revision

1. Electrons

   • Group= number of electrons in outer shell.
     • Sodium= 2,8,1 so it's in group 1
     • Nitrogen = 2,5 so in group 7
   • -1 Charge
   • Arranged by shells

2. Compounds

   • Water compound
   • Two or more atoms
   • Covalent Bonds
     • Simple
       • Low melting points
       • Non-metals
       • Atoms
       • Don't conduct electricity
     • Giant
       • High Melting Point
       • Some can conduct electricity

3. Periodic table

   • Arranged by atomic mass.
   • 8 groups

4. Protons and neutrons

   • Number of protons is found on the periodic table
   • Neutrons = atomic mass- atomic number
   • Found in nucleus

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