Chemistry Revision

Chemistry Revision

1. Structure of a atom

   • rules
     • all matter is made out of atoms
     • they can not be created or destroyed
     • atoms in a element are identical
     • they can not be broken down into smaller pieces
     • ATOMIC THEORY
   • Structure of atoms
     • Electrons, Protons, Neutrons

2. Atomic Number

   • Elements were grouped because of similar properties
   • Number of protons
   • Number of Protons

3. Mass Number

   • Protons+neutrons
   • Protons+neutrons
   • Atomic number= protons only
   • Neutrons=mass number-atomic number
   • Electrons=Protons

4. Isotopes

   • Same atomic number
   • Different mass numbers
   • The nucleus could be split
     • Produces new elements
   • similar chemical properties
   • different physical properties

5. Relative atomic mass

   • RAM
   • Mean mass
   • Rounded to a whole number

6. Periodic Table

   • Chemical and physical properties
   • electronic configuration
     • nucleus=0 electrons
     • 1st shell=2
     • 2nd shell=8
     • 3rd shell=8
     • 4th shell=18 (but only draw 2)

7. History of the atom

   • Rutherford
     • gold foil
     • found out atoms are small and dense
       • empty space
   • Bohr
     • nucleus has protons and electrons
     • elections orbit on electron shells

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