Atomic structure by Mr Law Hock Ling

1. Edufest 2013

2. Sec 3 Chemistry Timeline
Topic
Date
Kinetic Particle Theory
Jan
Experimental Techniques
Jan-Feb
Elements, Compounds and
Mixtures
Feb
Atomic Structure
Feb-Mar
Chemical Bonding
Mar-Apr
Chemical Equations
Apr
Acids, Bases and Salts
Apr-May
Chemical Calculations
Jun-Jul
The Atmosphere and
Environment
Jul-Aug
Revision
Sep-Oct

3. Atomic Structure

4. It Boils Down To Atoms!

5. Subatomic Particles
care

6. The Model of an Atom
•One negative
charge (1-)
•Negligible
mass
(1/1836)
•No electric
charge
•Relative
mass of 1
•One positive
charge (1+)
•Relative
mass of 1

7. Bohr Model of an Atom

8. Electron arrangement in an Atom

10. Rules for Drawing Electronic Structures
• An electron occupies the ___________before
pairing up with another.
• __________energy shells are occupied first.
• First shell, max = ___ electrons
• Second shell, max = ___ electrons
• Third shell, max = ___ electrons
• Fourth shell, max = ___ electrons

11. Electronic Structure of a Magnesium atom

13. Representing the Proton and Mass
Numbers
Neutral Atom : No of protons = No of electrons

14. Skills Practice 1

15. Drawing Electronic Structures
Could you spot some patterns?

16. What is the relationship between
these three atoms?
ISOTOPES! ATOMS OF THE SAME ELEMENT WITH THE SAME NUMBER OF PROTONS AND
ELECTRONS, BUT DIFFERENT NUMBER OF NEUTRONS.

17. Skills Practice 2

18. T/F

19. Skills Practice 3