BRAINCAKEPeriods
The horizontal rows in the periodic table are called periods.
Period 1 contains only hydrogen and helium. Period 2 runs from lithium to neon and period 3 from sodium to argon.
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More in Periodicity
- The Periodic Table
- Metals and Non-Metals
- s, p, d and f Block
- Groups
- Reactivity
- Hydrogen and Helium
- Periodicity and Period 3 Elements
- Trends in Melting and Boiling Points
All 14 lessons in Periodicity · All AQA AS-level Chemistry topics