Group 1 (alkali Metals)
Overview
The alkali metals in Group 1 of the periodic table are among the most reactive metals you will study. Drop a small piece of lithium into water and it fizzes gently; do the same with potassium and it bursts into lilac flames. These dramatic reactions follow a clear pattern that reveals how the periodic table organises elements by their behaviour.
In this lesson you will explore how lithium, sodium, and potassium react with water and air, explain the trend in reactivity using electronic configuration, and learn how to predict the properties of alkali metals lower in the group such as rubidium and caesium.
Objectives
- Understand how the similarities in the reactions of these elements with water provide evidence for their recognition as a family of elements
- Understand how the differences between the reactions of these elements with air and water provide evidence for the trend in reactivity in Group 1
- Use knowledge of trends in Group 1 to predict the properties of other alkali metals
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Group 1 (alkali Metals). Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What products are formed when sodium reacts with water? A) Sodium oxide and hydrogen B) Sodium hydroxide and hydrogen C) Sodium chloride and water D) Sodium hydroxide and oxygen Answer: B
- Which Group 1 metal is the most reactive? A) Lithium B) Sodium C) Potassium D) Francium Answer: D
- Why does reactivity increase down Group 1? A) The atoms get smaller B) The outer electron is closer to the nucleus C) The outer electron is further from the nucleus and easier to lose D) The metals gain more electrons Answer: C
- What is observed when potassium is added to water? A) It sinks and dissolves slowly B) It floats, a lilac flame is seen and it reacts violently C) It floats and fizzes gently D) No reaction occurs Answer: B
- Which trend is correct for Group 1 metals going down the group? A) Melting point increases B) Reactivity decreases C) Density always decreases D) Melting point decreases Answer: D
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Practice Mock Questions
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