L5 Electronic Structure (Unit 1 Chemistry BTEC Applied Science)

This editable 43-slide PowerPoint covers electronic structure, atomic orbitals, subshells and electron configurations for Pearson BTEC Applied Science Unit 1 Chemistry. Designed to develop students’ understanding of how electrons are arranged within atoms, the lesson provides clear explanations, diagrams, worked examples and opportunities for independent practice.

The resource introduces electron shells, subshells and atomic orbitals, explaining how electrons occupy different energy levels around the nucleus. Students explore the structure and electron capacities of s, p, d and f subshells, including the shapes of s and p orbitals and the concept of electron density. An atomic orbital is defined as a region of space where there is a high probability of finding an electron.

The lesson then explores the Aufbau principle and the order in which electrons fill orbitals, including the relationship between 4s and 3d subshells. Students learn how to write electron configurations using subshell notation and represent electron arrangements using electron-in-box diagrams. The rules governing orbital filling, electron spin and electron pairing are explained, alongside the exceptional electron configurations of chromium and copper.

Further topics include ground and excited states, electron transitions between energy levels, and the absorption and emission of energy in accordance with Bohr’s atomic theory.

The PowerPoint includes a five-question starter activity with answers, clearly defined learning objectives, key scientific vocabulary, detailed diagrams, worked examples, guided activities and ten check-your-understanding questions with answers for self-assessment.

Ideal for classroom teaching, independent learning and revision, this resource supports students studying Pearson BTEC Level 3 Applied Science Unit 1 Chemistry.

File format: Editable PowerPoint (.pptx), 43 slides.

Resource date: October 2026.