C4

C4

1. Atoms

   • Particles
     • Proton
       • RELATIVE MASS : 1
       • Charge +1
     • Neutron
       • RM: 1
       • Charge: 0
     • Electon
       • RM: 0.0005
       • Charge: -1
   • No. of protons = No. of electrons in a neutral atom
   • electron added or removed = atoms become charged ----> ion

2. Line spectrum

   • some elements emit distinctive colours when heated.
     • Lithium (Li) = red flame
     • Sodium(NA) yellow/orange flame
     • Potassium(K) lilac flame
   • Each elements gives a characteristic line spectrum
     • Heated electron= Release energy as light
     • Different elements emit different wave lengths of light
       • different electronic arrangement

3. History of the periodic table

   • Döbereiner
   • Newland
   • Mendeleev