UNIT 3 CHEM

Number of Valence Electrons in Group 1?

1

Number of Valence Electrons in Group 2?

2

Number of Valence Electrons in Group 3-12?

2

Number of Valence Electrons in Group 13?

3

Number of Valence Electrons in Group 14?

4

Number of Valence Electrons in Group 15?

5

Number of Valence Electrons in Group 16?

6

Number of Valence Electrons in Group 17?

7

Number of Valence Electrons in Group 18?

8

How many Valence Electrons does Helium have?

2

What is the charge in Group 1?

+1

What is the charge in Group 2?

+2

What is the charge in Groups 3-12?

Varies

What is the charge in Group 13?

+3

What is the charge in Group 14?

±4

What is the charge in Group 15?

-3

What is the charge in Group 16?

-2

What is the charge in Group 17?

-1

What is the charge in Group 18?

0, they are balanced

Octet Rule

Each atom wants 8 Valence Electrons to be balanced

Cation

Positive ion

Anion

Negative ion

If an atom has 2 valence electrons, what will its charge be?

+2 — easier to lose two than gain six electrons

If an atom has 7 valence electrons, what will its charge be?

-1 — easier to gain one than lose seven electrons

What is the charge of Ag (Silver)

+1

What is the charge of Zn (Zinc)

+2

What is the charge of Cd (Cadmium)

+2

What charge does Pb (Lead) have?

Varies

What charge does Sn (Tin) have?

Varies