1. Use the periodic table in your agenda to fill in the chart.
Element Metal, Nonmetal, or
Metalloid?
Neon (Ne)
Sodium (Na)
Chlorine (Cl)
Silicon (Si)
Calcium (Ca)
Gold (Au)
Arsenic (As)
Nonmetal
Metal
Nonmetal
Metalloid
Metal
Metal
Metalloid

2. ReviewReview
Metals
Nonmetals
Metalloids

3. Electron ConfigurationElectron Configuration
Electrons orbit around the
nucleus
Form a “cloud” around the
nucleus
The “cloud” has “layers”
“Layers” = energy shells

4. Energy LevelsEnergy Levels
 First shell is closest to the
nucleus
 Holds up to 2 electrons
 The second shell holds up
to 8 electrons

5. Energy LevelsEnergy Levels
The third shell holds up
to 18 electrons
There are more than 3
shells

6. Energy LevelsEnergy Levels
No. of shells depends on the no.
of electrons
Each shell must be full before a
new one forms
The Period Number tells you how
many energy shells an atom has

7. Valence Electron(s)Valence Electron(s)
Electron(s) in the outer most
shell of an atom
The Group Number tells you
the number of valence
electron(s)

8. Valence Electron(s)Valence Electron(s)
Group 1, 1 valence
electron
Group 13?
3
Determines an elements
reactivity

10. Octet RuleOctet Rule
Elements need 8
valence electrons to be
stable
Or their outer shell is
full

11. Argon Atom
8 valence electrons = stable
Outer shell is full = stable