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C3 (1): Development Of The Periodic Table

The Early Periodic Table

During the 19th century scientists tried to find ways to classify
elements based on their properties and atomic weight.

In 1863 Newlands (some guy that I don't know the first name of)
came up with the law of octaves…

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Group 1: The Alkali Metals

Some basic stuff about alkali metals:

They are very reactive metals

More reactive as you go down the group

Soft solids at room temperature

Low melting / boiling temperature (this decreases as you go down
the group)

Low density, some float on water (lithium, sodium,…

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All have seven electrons in their outer shell.

They form ionic compounds with metals in which their ions have a
-1 charge.

They bond covalently with non-metals to form molecules.

Reactivity decreases as you go down the group

A more reactive halogen can displace a less reactive halogen from

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Many transition elements (and compounds containing transition
elements) are used as catalysts.


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