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Year 9 - Science

Group 1 and 2 metals

Patterns in the periodic table

Unit Summary

This unit explores the periodic table, including the principles behind Mendeleev's design, the arrangement of elements into periods and groups, and the classification of metals and non-metals. It examines how the physical and chemical properties of elements predict reaction patterns.

Lesson Summary

You will learn to describe the pattern in the reactivity of Group 1 metals with water and Group 2 metals with dilute acid, and compare the reactivity of the two groups.

Key Notes

The properties of elements in each group of the periodic table change gradually down the group.
Group 1 metals are soft, have lower densities than most other metals, and become more reactive down the group.
Group 1 metals are called alkali metals because they react with water to form an alkaline solution and hydrogen gas.
Group 2 metals react with dilute acids to form a salt and hydrogen gas.
Group 2 metals become more reactive down the group, but they are less reactive than Group 1 metals in the same period.

Vocabulary To Learn

alkali: An alkali is a soluble base with a pH greater than 7.
alkaline: Alkaline refers to a substance that has the properties of an alkali or contains an alkali. It is often used to describe solutions of soluble bases with a pH greater than 7.
group: A group is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.
period: A period is a row on the periodic table that corresponds to the number of electron shells in an atom.

Common Mistakes To Avoid

Group 2 metals are more reactive than Group 1 because reactivity increases across the groups.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

The properties of elements in each group of the periodic table change gradually down the group. Group 1 metals are soft, have lower densities than most other metals, and become more reactive down the group.

2. Define this scientific word and use it in context. 'alkali'

An alkali is a soluble base with a pH greater than 7. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Group 2 metals are more reactive than Group 1 because reactivity increases across the groups. Correction: Group 1 metals are more reactive with water; reactivity increases down a group (for Groups 1 and 2), not along a period.

More Lessons In This Unit

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