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Quick overview
· Most reactive non metallic group
· Diatomic structure
· High electronegativity
· At room temperature
o Fluorine (very reactive) Pale yellow gas
o Chlorine Greenish gas
o Bromine Red-Brown Gas
o Iodine Black Solid
o Astanine is radioactive so very dangerous…read more

Slide 3

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Physical Properties…read more

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Atomic Radius
· Increases down the group
· 1 extra filled outer electron shield
· Increasing nuclear charge counteracted by
increased shielding…read more

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Electronegativity
· Decreases down the group
· Depends on attraction of nucleus to bonding
· Affected by:
-Electron shells, more shells therefore more shielding from
increasing nuclear charge.
-Atomic radius, electrons are further from the nucleus therefore
nuclear attraction is reduced
-Atomic number, nuclear charge increases but is counteracted
by the increase in electron shells.…read more

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Melting points and boiling points
· Increase down the group
· The halogens bond as diatomic molecules and the
intermolecular forces will be weak Van der Waals
attractions (instantaneous ­ induced dipole).
· The atomic radius increases down the group, so the
molecules have a greater surface area.
· The bigger surface area results in greater surface
contact, and so the intermolecular forces are larger.
These require more energy to overcome, and so the
boiling point is increased.…read more

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