Alkali Metals Properties and Trends

This lesson covers alkali metals in group one of the periodic table, focusing on their properties and reactivity trends. It includes practical demonstrations with lithium, sodium, and potassium, highlighting their reactions with water and the production of hydrogen gas and alkaline solutions. The lesson also discusses the increasing softness and reactivity of alkali metals down the group, as well as changes in density, melting points, and boiling points.

Which group do alkali metals belong to in the periodic table?

• Group 1

• Group 4

• Group 2

• Group 3

What is a common property of alkali metals regarding their electron configuration?

• They have two electrons in their outer shell

• They have no electrons in their outer shell

• They have one electron in their outer shell

• They have a full outer shell

What happens when lithium is added to water?

• It explodes

• It remains unchanged

• It floats and fizzes

• It sinks and dissolves

What color does the universal indicator turn when lithium reacts with water?

• Green

• Yellow

• Blue or Purple

• Red

How does sodium's reaction with water compare to lithium's?

• Sodium does not react

• Sodium reacts more vigorously

• Sodium reacts the same

• Sodium reacts less vigorously

What is a notable observation when potassium reacts with water?

• It produces a green flame

• It produces a lilac flame

• It produces a red flame

• It does not produce a flame

What is the trend in softness of alkali metals as you move down the group?

• Softness decreases

• Softness increases

• Softness remains the same

• Softness fluctuates

How does the reactivity of alkali metals change as you move down the group?

• Reactivity decreases

• Reactivity fluctuates

• Reactivity remains constant

• Reactivity increases

What happens to the melting and boiling points of alkali metals as you move down the group?

• They fluctuate

• They remain constant

• They decrease

• They increase

Which alkali metal is known to be radioactive and rare in nature?

• Potassium

• Sodium

• Francium

• Lithium