Groups and Trends

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Melting and boiling points increase as you go down the group

7 electrons in the outer shell (group 7 duh)

gets darker in colour as you go down the group

all diatomic molecules

Chl

Chorine is a toxic gas that cannot be stored easily

- reacted with potassium manganate to produce potassium chloride which is then dissolved in water which separates some of the chloride ions into chlorine

overall product=

halogens with iron wool

Most reactive: fluorine

Least reactive: iodine

Reactivity decreases as you go down the group

Fluorine is the most reactive because it has the least electrions

halogen: element in group 7

halide: compound of a halogen and another element

More reactive halogens replace halides

Group 7

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