6.1 - Recognising Groups 1, 7 and 0
Learn to recognise alkali metals, halogens and noble gases from their positions in the periodic table, including why hydrogen is an exception.
Classifying by group
A group is a vertical column in the periodic table. Elements in three of these columns have useful family names:
| Group | Family | Examples |
|---|---|---|
| Group 1 metals | alkali metals | lithium, sodium, potassium |
| Group 7 | halogens | fluorine, chlorine, bromine, iodine |
| Group 0 | noble gases | helium, neon, argon, krypton |
[DIAGRAM: asset_name: group_classification_extract: Periodic-table positions used for classification - diagram 1; asset_slug: 147_6_1_classifying_group_1_group_7_and_group_0_elements_diagram1; file: 147_6_1_classifying_group_1_group_7_and_group_0_elements_diagram1_imagegen_v1.png; recommended_method: imagegen; description: Exact monochrome periodic-table extract showing periods 1-4 and the selected columns Group 1, Group 7 and Group 0, with middle groups omitted. Labels show H as not an alkali metal, Li/Na/K as alkali metals, F/Cl/Br as halogens, and He/Ne/Ar/Kr as noble gases. Assessed visual because the lesson depends on exact group positions; labels and layout have been visually checked.]
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