Chemistry — Concept Map: The Periodic Table

# The Periodic Table

## Structure
- Periods (rows)
- Groups (columns)
- Blocks (s, p, d, f)

## Metals
- Alkali metals (Group 1)
- Alkaline earth (Group 2)
- Transition metals

## Non-metals
- Halogens (Group 17)
- Noble gases (Group 18)

## Trends
- Atomic radius
- Ionisation energy
- Electronegativity