Group 7: The Halogens (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Group 7: The Halogens
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Colour & state of chlorine

Yellow-green gas

Colour & state of bromine

Orange-red liquid

Colour & state of iodine

Shiny grey solid

Reactivity trend in Group 7

Decreases down the group

Outer shell electrons in Group 7

7 electrons

Why reactivity decreases down Group 7

Outer e- further from nucleus, less attraction

Melting & boiling point trend in Group 7

Increase down the group

Appearance of metal halides

White solids

Use of chlorine in water

Kills bacteria in drinking water & swimming pools

Chlorine + NaOH forms

Sodium chlorate(I) / NaOClNaOCl (bleach)

Difference: antiseptic vs disinfectant

Disinfectant stronger; antiseptic safe on skin

Use of iodine

Antiseptic to kill bacteria

Use of fluorides

Added to toothpaste & water; reduce dental decay

Use of silver bromide & iodide

Photographic film (sensitive to light)

Products of NaClNaCl electrolysis

Chlorine gas, hydrogen gas, sodium hydroxide

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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