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Groups
A vertical column of elements in the periodic table is a group. The elements in a group
have similar chemical properties to each other. For example, group 1 contains sodium and
other very reactive metals, while group 7 contains chlorine and other very reactive
non-metals. Group 0 (also known…

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Their atoms all have one electron in their highest occupied energy level (outermost shell).
This gives the group 1 elements similar chemical properties to each other.

Group 1 elements


Element Symbol Electronic structure Electronic structure
(written) (drawn)

lithium Li 2,1




sodium Na 2,8,1




chlorine K 2,8,8,1




Reactions of group 1…

Page 3

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The group 1 elements need to be stored under oil to prevent them reacting with oxygen
and water vapour in the air.

Reactions of group 1 elements with oxygen
Lithium, sodium and potassium are easily cut with a blade. The freshly cut surfaces are
silvery and shiny, but quickly turn…

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