Chemistry (AS Level)·The Periodic Table & periodicity · NSSCAS 3.1.1–3.1.2
Periodicity of Physical Properties
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The Periodic Table isn't just a list — its physical properties repeat in beautiful patterns. Learn how atomic radius, ionic radius, electronegativity and first ionisation energy vary across Period 3 and down Groups 2 and 17, how melting point and conductivity follow the bonding, and how to explain every trend using nuclear charge, shielding and atomic radius.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 3.1.1–3.1.2):
- Explain and use the term ionisation energy and the factors influencing it
- Explain the variation in atomic radius, ionic radius and electronegativity across Period 3
- Explain the trend in first ionisation energy across Period 3
- Explain the variation in melting point and conductivity across Period 3 in terms of bonding
- Explain the trends in radius, electronegativity and first ionisation energy down Groups 2 and 17
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