1. ATOMS

2. Atoms All material is made up of tiny particles called atoms.
Atoms contain protons, neutrons and electrons.

3. Structure of an Atom
(1)
(2)
(3)

4. Sub-atomic particles Sub-atomic particle Charge Mass Position Proton
Neutron
Electron +1 -1
About the same as a neutron
About the same as a proton
About 2000 times smaller than a proton or neutron
In nucleus
Outside nucleus

5. Structure of an Atom - Lithium

6. Structure of an Atom – Electron shells
Each electron shell can only hold a certain number of electrons.
The first electron shell can hold up to 2 electrons.
The second electron shell can hold up to 8 electrons.
The third electron shell can hold up to 8 electrons.

7. 6 12 Atomic (proton) number – number of protons in an atom.
Mass number – number of protons plus neutrons in an atom.
What is the
atomic number
of carbon?
mass number 6 12

8. See Electron configuration.FLA

11. The atomic number and mass number (and / or atomic mass) for each element is shown on the Periodic table.

12. PhET build-an-atom applet

13. Can you do better? Hank Helps
Little Benny Bouncy Consistently Near Open Fire Nextdoor
Nasty Mr Allen Said People Should Climb Around
K Ca
Can you do better?
Harry He
Likes Beer But Could Not Often Find aNe
Nasty Mr Allen Said People Should Climb Around
K Ca

14. See Element properties.FLA