Edufest 2013

CHEMISTRY – AN ESSENTIAL SCIENCE

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

Sec 3 Chemistry Timeline

Atomic Structure

It Boils Down To Atoms!

Subatomic Particles

care

The Model of an Atom•One negative charge (1-)•Negligible mass (1/1836)

•One positive charge (1+)•Relative mass of 1

•No electric charge•Relative mass of 1

Bohr Model of an Atom

Electron arrangement in an Atom

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

Electronic Structure of a Magnesium atom

Representing the Proton and Mass Numbers

Neutral Atom : No of protons = No of electrons

Skills Practice 1

Drawing Electronic Structures

Could you spot some patterns?

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.

Skills Practice 2

T/F

Skills Practice 3