The alkali metals and the halogens

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Group 1- the alkali metals
One outer electron.

As you go down group 1 the alkali metals get more reactive,
because of shielding it is easier for the electron in the outer shell to be lost.
The nucleus is further away from the outer electron so the forces are weaker.

The melting and boiling points also get lower as you down down group 1.

The alkali metals have a low density (the first three are less dense than water).

Li
Na
K
Rb
Cs
Fr

Alkali metals form ionic bonds with non-metals (halogens).
They want to lose the outer electron to become a 1+ ion.
They DON'T form covalent bonds.
Alkali metals produce soluble white compounds that form colourless solutions.

Reacting alkali metals with water produces hydrogen gas.
The metal will float…

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