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ChemistryAQA (7405) / Edexcel (9CH0)Inorganic Chemistry

Periodic Table Explorer

AQA / Edexcel A-Level Chemistry

The periodic table is the foundation of A-Level Chemistry. This interactive explorer lets you click on any element to reveal its electron configuration, atomic radius, first ionisation energy, electronegativity, and oxidation states. Explore trends across periods and down groups — ionisation energy, atomic radius, electronegativity, and melting point — with visual indicators and exam-relevant explanations. Covers the s-block, p-block, d-block, and transition metal chemistry aligned to AQA and Edexcel specifications.

Uses Google Fonts (Space Mono, Sora). Requires an internet connection for full styling.

Frequently asked questions

Why does ionisation energy generally increase across a period?+
Across a period, the nuclear charge increases as protons are added, while electrons are added to the same energy level (shielding stays roughly constant). The increased nuclear charge pulls outer electrons closer, making them harder to remove — so ionisation energy increases.
Why does atomic radius decrease across a period?+
As the nuclear charge increases across a period with constant shielding, the outer electrons are pulled closer to the nucleus. This reduces the atomic radius despite the same number of electron shells being occupied.

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