1. Drill
How many valence electrons does sulfur have?

2. Agenda
2A: Electron Stability
Finish Periodic Trends Activity
Periodic Trends Notes
Periodic Trends Practice
Exit Slip
HW: Review Packet

3. Atomic Radius
One half the distance between the nucleus of two bonding atoms

4. Atomic Radius Trends: Decreases from left to right
Stronger nuclear charge on the right pulls electrons closer to the nucleus
Increases from top to bottom
Increased number of energy levels
In a period the electrons are all on the same principle energy level, they are pulled closer to the nucleus
The outer electrons are shielded from the nucleus by the complete inner shells

6. Ionization Energy
The amount of energy required to remove the outermost electron of an atom of an element

7. Ionization Energy Trends: Increases from left to right
Metals on the left side prefer to give up electrons to form a stable octet
Nonmetals on the right side want to take electrons, not give them up
Decreases from top to bottom
Shielding makes it easier to remove electrons from larger atoms because the e- are farther away from the attraction of the nucleus

9. Electronegativty
The tendency for an atom to attract a pair of bonding electrons when it is combined with another atom in a chemical bond

10. Electronegativity Trends: Increases from left to right
Nonmetals prefer to gain electrons, whereas metals prefer to lose electrons
Decreases from top to bottom
The smaller the atom is, the greater the attraction felt by the nuclear charge

12. **Coach Class: After school on THURSDAY!
Looking forward
Review: Thursday
Unit 2 Test: Monday
**Coach Class: After school on THURSDAY!

13. Homework
Finish Review Packet