Year 8 Science · Unit 2 · Lesson 11

The Periodic Table

Foundation Worksheet

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Date

Class

Learning Goals

Identify that the modern periodic table organises elements by atomic number.
Recall key features of the table: periods (rows), groups (columns), and ~118 elements.
Recognise Mendeleev's contribution, arranging by atomic mass and predicting gaps.

Warm Up

Sort it!

Write each statement from the pool into the correct category box. There are 6 statements that are true of the periodic table and 4 that are NOT.

Elements are arranged by atomic number Rows are called periods Columns are called elements Mendeleev arranged by mass and left gaps The table has exactly 100 elements Elements in the same column have similar properties The periodic table was invented by Newton Period 1 has only 2 elements (H and He) All elements on the table are found in nature Atomic number increases left to right across a period

True of the periodic table

NOT true of the periodic table

Your Turn

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.

Mendeleev organised elements by atomic number.

Correct it:

The periodic table has 7 periods and 18 groups.

Correct it:

Each element in the periodic table has a unique atomic number.

Correct it:

The symbol for an element provides a language-independent shorthand that scientists worldwide can use.

Correct it:

All 118 elements in the periodic table were known to ancient Greeks.

Correct it:

Show What You Know

1. What does the atomic number of an element tell you?

Recall 1 mark

2. State two reasons why the periodic table is a useful scientific tool.

Recall 2 marks

Wrap Up

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