BRAINCAKETrends in Melting and Boiling Points
Across periods 2 and 3, the melting point increases from groups 1 to 14 (4) then there is a sharp decrease in melting point between group 4 and 5. The melting point of groups 5 to group 8 are lower than those in the first four groups.
The elements in groups 1 to 4 have giant structures. The elements in groups 5 to 7 have simple molecular structures and group 8 elements exist as single atoms.
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Key terms in this lesson
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
- Period
- A horizontal row of the periodic table, containing elements with the same number of electron shells.
More in Periodicity
- Periods
- Reactivity
- Hydrogen and Helium
- Periodicity and Period 3 Elements
- Atomic Radii
- First Ionisation Energy
- Group 2 and 3
- Group 5 and 6
All 14 lessons in Periodicity · All AQA AS-level Chemistry topics