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Slide 1

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Group 7
Halogens…read more

Slide 2

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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

Slide 4

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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

Slide 5

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· 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

Slide 6

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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

Slide 7

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