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Matter and materials: Identify, describe and apply properties of the periodic table

Unit 2: Electron configuration

Emma Harrage

Unit outcomes

By the end of this unit you will be able to:

  • Arrange electrons into core and valence electrons and write electron configuration of first 20 elements.
  • Write the electron configuration for the first 20 elements.

What you should know:

Before you start this unit, make sure you can:

Introduction

In this unit you will learn to arrange the first 20 elements into groups of core and valence electrons and write their electron configurations. The first 20 elements start at hydrogen (H) and continue vertically across the table until you reach calcium (Ca). They are called the first 20 elements because of their atomic number.

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