chemistry atom

chemistry atom

1. nucleus

   • protons
     • neutral mass
       • 1
     • charge = +1
   • neutrons
     • neutral mass
       • 1
     • charge = neutral
   • electrons
     • negilgible mass
       • nearly 0
     • charge = -1

2. atoms

   • protons = electrons
     • atom is neutral
   • atomic number
     • number of protons
   • atomic mass
     • protons + neutrons

3. isotopes

   • isotopes are different atomic form of the same element,which have the same number of protons but a different number of neutrons
   • carbon 12 and carbon 14

4. ions

   • lose or gain of electrons
   • Na+

5. ionic bonding

   • always a giant ionic lattice
     • ions form closely, regularly packed lattice
   • there is a very strong electrostatic attraction force
   • give and take
   • high melting and boiling point
   • doesn't conduct electricity when its solid
     • because no free electrons
   • conducts electricity when its a liquid
     • there is free electrons

6. covelant bonding

   • sharing of electrons
   • intermoluculer attraction force
   • double,triple.....bonds