Year 8 Science · Unit 2 · Lesson 14
Foundation Worksheet
Learning Goals
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
Reactivity of alkali metals increases as you go down Group 1.
Correct it:
Fluorine is less reactive than iodine in Group 17.
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Atomic number decreases across a period from left to right.
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Elements in the same group have similar chemical properties.
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The pattern in Group 1 means we can predict that francium (Fr) would be very unreactive with water.
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Fill the gap
Choose the correct word from the word bank to complete the passage below. Each word may only be used once.
The periodic table is organised into columns called s and rows called s. Elements in the same column tend to have similar chemical properties, which is why knowing one element's behaviour helps us what others in the same column will do. Going down a group, the of alkali increases, potassium reacts more vigorously with water than lithium does. In contrast, the reactivity of such as the halogens decreases as you go down their group, fluorine is the most reactive halogen of all. Across a period from left to right, atomic number by one step at a time.
1. Name two groups in the periodic table and state one observable property that the elements in each group share.
2. A student observes that lithium reacts gently with water. Using the pattern in Group 1, what would you predict about the reaction of rubidium (Rb) with water? Give one reason for your prediction.
Wrap Up
In one sentence, what was the main idea of this lesson?