Paul is SMART!

• This week’s strategy is TIPs and Genre• T – Title• I – Information (captions, footnotes, etc.)• P – Pictures• Genre – what category does it fall under?

Example: Recognizing Energy Article

• What was the TIPs and genre?

Your turn!

Finally, The ATOM as we know it

Unit 5: Structure of Matter

Size of an atom

But what is an Atom?

• An atom is…– The smallest form of an element• All atoms of an element have the same characteristics

(i.e. # of protons)

– An atom has 3 sub-atomic particles • Proton (+ charge)• Neutron (no charge)• Electron (-charge)

• REMEMBER, all matter is made up of atoms!

Atomic Mass (or the mass of an atom)

• The mass of an atom is mainly the mass of the protons and neutrons combined

• Electrons barely have a mass compared to protons and neutrons

Bohr Model

Sodium Atom (Na)- electron cloud model

How do the sub-atomic particles compare?

Sub-atomic particle

charge location Relative mass

Proton

neutron

electron

Practice test question:

• What is the smallest unit of an element that still has the properties of that element?

A. an atomB. a compoundC. an electronD. a molecule