Starter quiz
- Match the following symbols to their elements.
- Na⇔sodium ✓
- K⇔potassium ✓
- Rb⇔rubidium ✓
- Fr⇔francium ✓
- Li⇔lithium ✓
- Cs⇔caesium ✓
- Elements are said to be in the same ______ if they are in the same column of the periodic table.
- 'group' ✓
- Place these elements in order of decreasing relative atomic mass.
- 1⇔francium
- 2⇔caesium
- 3⇔rubidium
- 4⇔potassium
- 5⇔sodium
- 6⇔lithium
- Elements in a group have similar physical properties. What is meant by a physical property?
- Features that can be observed without changing the substance itself. ✓
- Features of the way a substance reacts with other substances.
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- What type of category best describes Group 1 elements?
- reactive metals ✓
- halogens
- transition metals
- non–metals
- noble gases
-
- Which Group 1 element has 55 protons, 55 electrons and 78 neutrons?
- Cs ✓
- Mg
- Pt
- Fm
-
Exit quiz
- What is the name given to Group 1 of the periodic table?
- halogens
- alkali metals ✓
- noble gases
- transition metals
-
- What is the correct electron configuration of sodium?
- 2,1
- 2,8
- 2,8,1 ✓
- 2,8,8,1
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- Reactivity ______ down the group for Group 1 elements.
- 'increases ' ✓
- Place the following Group 1 metals in order of density, starting with the least dense element first.
- 1⇔lithium
- 2⇔potassium
- 3⇔rubidium
- 4⇔caesium
- Explain why you would expect francium to be more reactive than caesium.
- Outer electron in francium is attracted with less force to its atomic nucleus. ✓
- Outer electron in caesium is attracted with more force to its atomic nucleus. ✓
- Outer proton in francium is attracted with more force to its atomic nucleus.
- Outer proton in caesium is attracted with less force to its atomic nucleus.
- Francium has more electron shells. ✓
-
- What are the products of the reaction between lithium and water?
- lithium hydroxide ✓
- lithium oxide
- hydrogen ✓
- an alkaline solution ✓
- water
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Group 1 elements are very reactive and their reactivity increases down the group.
- Moving down Group 1 elements, atomic mass, density and melting points increase.
- In chemical reactions, atoms of Group 1 elements lose one outer electron leaving full electron shells.
- Going down Group 1, the outer electron of each element is attracted to the atomic nucleus with less force.
- Group 1 metals react with water to produce alkaline solutions.
Common misconception
Pupils can confuse the trend in reactivity down the group.
The practical reacting the metals with water helps to memorably demonstrate the trend, however it is important to ensure that pupils can explain why this happens.
Keywords
Alkali metals - Alkali metals are the elements in Group 1 of the periodic table which react with water to form strongly alkaline hydroxides.
Density - Density is a measurement of mass per unit volume; how tightly packed a substance's particles are in a particular space.
Alkali metal hydroxides - Alkali metal hydroxides are soluble compounds formed when the alkali metals react with water. They form colourless solutions.
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