Year 10 Chemistry- Periodic Trends

This source explains periodic trends, which are the predictable patterns of chemical and physical properties observed across the periodic table. It primarily focuses on how atomic radius changes, decreasing across a period due to increased nuclear pull and increasing down a group because of added electron shells. The text further details ionic radii, noting that cations are smaller and anions larger than their neutral atoms, following similar size trends. Finally, it delves into reactivity, differentiating between metals (more reactive down a group) and non-metals (more reactive across a period), and introduces electron shielding as a key concept that explains these trends by describing how inner electrons diminish the nucleus's pull on outer electrons.