Reminders/InfoQuiz tomorrow – Metals, nonmetals,

metalloids, electron configuration, valence electrons, electron dot structures

Homework due Friday at the beginning for raffle chance

Friday you will be able to do makeup work in class – bring your textbook

Can you do this?

Explain why atoms are neutral in charge.

HINT: think about the charges and numbers of the subatomic particles

Atoms have equal numbers of protons and electrons

Protons and electrons have opposite charges

Equal and opposite charges cancel out

12-15-10Cornell Notes

A single atom or groups of atoms with either a positive or negative charge.

Cation: positively charged ion

Anion: negatively charged ion

Ions form when atoms lose or gain valence electrons.

Lose electrons = Make a CATION

Gain electrons = Make an ANION

Na Na+

Atoms lose, gain or share electrons in order to acquire the stable electron configuration of a noble gas.

Lose all valence electrons, or gain electrons until it has 8

Na Cl+ Na+ Cl+-

Cation,Like Ne

Anion,Like Ar

Groups 1 to 4 give their valence electrons away

12 13 14

Li Li+

Mg Mg2+

B B3+

Groups 5 to 7 take electrons

5 67 P P3-

O O2-

F F-

Group 8 doesn’t form ions (noble gases)They already have the lucky 8 electrons!

8

What would be the ion for Calcium (Ca)?

Group

Gain/Lose electrons

Charge

2

Lose

2+

IonCa2+

# valence electrons 2

What would be the ion for Boron (B)?

Group

Gain/Lose electrons

Charge

3

Lose

3+

IonB3+

What would be the ion for Phosphorus (P)?

Group

Gain/Lose electrons

Charge

5

Gain

3-

IonP3-

1. For each element, identify: The group Whether the element gains or loses electrons The charge of the ion The written form of the ion

2. You may work in groups

3. 2 bonus points if you get all the answers correct

4. Hand in your work at the end of class