L8 - Group I properties

• Chemistry
• Secondary Education

Lesson 1 - What is IGCSE Chemistry?

4

10

Lesson 8 - Group I Properties

Today, I'm going to...

• know the name of the Group I elements,
• be able to make sense of the trends down the group in terms of properties and 
• understand why the properties of other elements in the same group can help you predict the identity of an unknown element.

Lesson 8 - Group I properties

• I can state the name of group I elements.
• I can identify the group trend regarding hardness, melting and boiling points, density, and reactivity.
• Given information about the other elements, I can predict the properties of rubidium and caesium.

I am successful if...

Are the elements of the Periodic Table arranged according to density? Explain your choice.

Group I elements

Group I elements

Alkali Metals

Group I elements

Alkali Metals

Group I elements

Alkali Metals

Group I elements

Alkali Metals

Why Alkali?

Group I elements

Alkali Metals

+  water

+  water

+  water

+  water

+  water

+  water

Why Alkali?

Group I elements

Alkali Metals

+  water

alkaline 

+  water

+  water

+  water

+  water

+  water

alkaline 

alkaline 

Why Alkali?

Group I elements

Alkali Metals

+  water

alkaline 

+  water

+  water

+  water

+  water

+  water

alkaline 

alkaline 

Why Alkali?

www.rsc.org

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Which symbol represents the most reactive alkali metal?

1. Ca
2. Cr
3. Cs
4. Cu

How does the melting point change down the alkali metals group?

How does the density change down the alkali metals group?

Which words can be used to describe a Group I element?

conductor

dense

dull

hard

inert

insulator

lustrous

reactive

soft

britt;e

Which symbol represents the element with an electron arrangement of 2, 8, 1?

1. Cs
2. K
3. Li
4. Na

Using the following electronic configuration:

Li = 2, 1                    Na = 2, 8, 1                   K = 2, 8, 8, 1 

Explain how you can tell that all these elements belong to Group I.

Observations must include:

• Gas production
• Heat produced by the reaction 
• Production of alkaline solution
• Production of flame

SDA 1.2 (Practical)

Potassium + water

How does the reactivity change down the alkali metals group?

• I can state the name of group I elements.
• I can identify the group trend regarding hardness, melting and boiling points, density, and reactivity.
• Given information about the other elements, I can predict the properties of rubidium and caesium.

I am successful if...

Self-check

• Open your notebook.
• Look for this.
• Read.
• Reflect.
• Complete.