H2 Chemistry Notes: CORE IDEA 1, Topic 1 - Atomic Structure
Download printable cheat-sheet (CC-BY 4.0)10 Feb 2025, 00:00 Z
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Q: What does H2 Chemistry Notes: CORE IDEA 1, Topic 1 - Atomic Structure cover?
A: Review quantum numbers, electron configurations, ionisation trends, and spectroscopy evidence for the Core Idea 1 Atomic Structure topic in the 2026 H2 Chemistry syllabus.
Atomic structure underpins every other area of H2 Chemistry. You need to know how quantum numbers define electron positions, how orbitals fill, and how evidence from spectroscopy backs the quantum model. These notes focus on the ideas that repeatedly appear in structured and data-based questions.
Status: SEAB H2 Chemistry (9476, first exam 2026) syllabus and Chemistry Data Booklet last checked 2026-01-13 (both PDFs last modified 2026-01-13). Core Idea 1: Atomic Structure remains assessed across Papers 1–3 (with data booklet support where relevant).
1 Quantum Numbers at a Glance
| Symbol | Name | Typical values | What it tells you |
| Principal quantum number |
