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← Chemistry notes
Edexcel IGCSE·Chemistry·IGCSE Chemistry

Groups & Periodic Trends

13 min read

Group 1 alkali metals, Group 7 halogens, and Group 0 noble gases and their trends.

Group 1 — alkali metals (Li, Na, K)

Soft, reactive metals stored under oil. React vigorously with water → metal hydroxide + hydrogen (alkaline solution). Reactivity increases down the group (outer electron lost more easily as atoms get larger with more shielding).

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