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Chemistry In Action

11.1- The Halogens

I already know about the group 7 elements.

E.g. Chlorine:

7 electrons in the outermost shell
None metal
Has a very low melting/boiling point
Forms diatomic molecules
Highly electronegative
Does not conduct electricity

Physical Properties

The gaseous halogens vary in appearance. They get darker…

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Chemistry In Action

Size Of Atoms

The atoms get bigger as we go down the group because each element
has one extra filled main level of electrons compared with the one above.
Atomic Melting Boiling
Atomic Electron
Halogen Electronegativity Radius Point Point
Number, Z Arrangement (T_m/K)
(nm) (T_b/K)

Fluorine 9…

Page 3

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Chemistry In Action

Remember to write a
halogen element as a
diatomic molecule e.g. F2,
not F.
Increase as we go down the group. This is because the larger atoms have
more electrons and this makes the van der Waals forces between the
molecules stronger. The lower the boiling point…


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