Year 7 Science · Unit 2 · Lesson 5

Elements and the Periodic Table

Foundation Worksheet

Name

Date

Class

Learning Goals

Define element, period, group, alkali metal and noble gas using key vocabulary.
Read a periodic table entry (atomic number, symbol, name).
Identify which items in a group do not belong, using knowledge of element families.

Warm Up

Fill the gap

Choose the correct word from the word bank to complete each sentence. Two words will not be used.

element periodic table group period alkali metals noble gases compound molecule

An is a pure substance made of only one type of atom that cannot be broken down by chemical means. All known elements are organised in the , a chart that arranges elements so that those with similar properties line up in the same column. A horizontal row in this chart is called a , while a vertical column is called a . Elements in Group 1 are known as because they react vigorously with water, producing hydrogen gas. Elements in Group 18 are called because they are extremely unreactive and rarely form compounds with other elements.

Your Turn

Odd one out

Circle the item that does not belong in each group. Then explain why it doesn't fit. Use your knowledge of element families from the periodic table.

#	Group	Odd one out + reason
1	Gold Neon Silver Copper
2	Lithium Sodium Potassium Argon
3	Helium Neon Argon Chlorine
4	Fe Au Na H₂O

Show What You Know

1. An element tile shows the number 79 at the top, the letters "Au" in the middle, and "Gold" at the bottom. What does each of these three pieces of information tell you?

Recall 2 marks

2. Iron (Fe) is mined in the Pilbara, Western Australia. Using lesson ideas, explain why iron is considered an element and not a mixture or compound.

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?