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Aishwarya
Pranav

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The color of the halogens become darker as you go down the group.

Fluorine is a pale yellow

Chlorine is a yellow-green

Bromine is red-brown

http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_21c/chemical_patterns/elementsrev5.shtml

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- poor thermal and electrical conductors in all phases, and as solids they are brittle and crumbly.
-The halogens have distinctive, unpleasant odors, will burn exposed flesh, and are toxic.
http://www.chemistryexplained.com/Ge-Hy/Halogens.html

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Reactions with Halogens

Metal + Halogen -> Metal Halide

Sodium + Chlorine → Sodium Chloride

2Na(s) + Cl₂(g) → 2NaCl(s)

Displacement Reactions

Chlorine + Sodium Bromide → Sodium Chloride + Bromine

Cl₂(aq) + 2NaBr(aq) → 2NaCl(aq) + Br₂(aq)

http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_21c/chemical_patterns/elementsrev6.shtml

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-extremely reactive due to electron gain affinity.
-electronegativity high

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Halogens are bleaching agents

ex. Chlorine is used to bleach wood pulp to make white paper

Halogens (not living) bacteria

ex. Chlorine is added to the water in swimming pools to (not living) any bacteria that may be harmful for the swimmers

Halogens are extremely poisonous

Iodine can damage the skin if handled improperly

http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_21c/chemical_patterns/elementsrev6.shtml

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- Halogens have low melting and boiling points

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Organic compounds containing halogens are used as fire-retardants (halons), as refrigerants (Freons), and in nonstick coatings (Teflon). Silver bromide and silver iodide have been used in photographic emulsions since the early days of photography.