Demonstration Outside

Complete the Chart

Complete the Chart

Think-Pair-Share

Question 1:

What did you notice about the reactions?

Think-Pair-Share

Question 2:

Which metal seemed the most reactive?

Think-Pair-Share

Question 3:

What do you think causes that difference?

Where are they on the Table?

Which groups do these elements belong to?

Where are they on the Table?

Valence Electrons

Valence electrons are those found in the outer ring of an atom

Valence electrons help us determine how reactive an element will be

Group 2 has two valence electrons

More VE = harder to lose = less reactive

Group 2

Group 1 has one valence electron

Less VE = easier to lose = more reactive

Group 1

Valence Electrons and Reactivity

The larger the atomic mass, the more reactive the element is. This is because the valence electrons are further away from the nucleus.

Atomic Mass and Reactivity

Exit Ticket - answer on the back of your chart paper

1. Which metal was the most reactive in the demonstration?

2. How does reactivity change as you move down a group?

3. How does the number of valence electrons affect reactivity?