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Science

The Periodic Table

Overview

Students explore the periodic table as an organised system for all known elements, discovering the patterns Mendeleev identified.

Learning Objective
Students understand what the periodic table shows and can use it to find information about elements.

Resources needed

  • A printed or hand-drawn periodic table — or draw a simplified version on the board

Lesson stages

0 / 7 done
  1. 1 Ask: what is an element? (A pure substance made of only one type of atom).
  2. 2 Introduce the periodic table: 118 known elements, each with its own box showing symbol, name, and atomic number.
  3. 3 Explain atomic number: the number of protons in the nucleus — what makes each element unique.
  4. 4 Introduce groups (vertical columns) and periods (horizontal rows).
  5. 5 Elements in the same group have similar chemical properties — e.g. Group 1 metals all react vigorously with water.
  6. 6 Introduce the metals/non-metals division — the staircase line separates them.
  7. 7 Ask: what patterns do you notice in the table? (Properties repeat periodically).

Tap a step to mark it as done.

Variations

  • Research one element in depth: its properties, uses, and where it is found naturally.
  • Compare Group 1 metals: lithium, sodium, potassium — predict how caesium would behave.
  • Discuss Mendeleev: how he arranged elements by properties and predicted undiscovered ones.
More information

Teach: element, symbol, atomic number, group, period, metal, non-metal, proton. The symbol system — Fe for iron, Na for sodium — comes from Latin names and is worth explaining.

Focus on reading one element from the table before introducing groups, periods, and trends.

Can students use the periodic table to find the symbol and atomic number of a given element? Can they predict the properties of an unknown element based on its position in the table?

Draw a simplified 20-element table on the board or in soil. The first 20 elements illustrate all key concepts.

Students often think the periodic table is just a list of elements. Its power is in the patterns — elements in the same group behave similarly.

The periodic table is one of the greatest intellectual achievements in science.

Activity details
Secondary Medium 25 minutes no prep Whole Class, Small Group Indoor & Outdoor
Topics
Periodic Table Elements Chemistry