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group 1 (changes down the group)
- mp and bp decrease
- reactivity gets higher
- density gets higher
reaction in water:
lithium = fast reaction, bubbles of a gas is produced
sodium = very fast reaction, sometimes catches fire and explodes
potassium to astatine = explosion
group 7 (changes down the group)
- mp and bp increase
- reactivity gets lower
- density gets lower
- colours get darker
- gas to solid
- displacement > occurs when a more reactive element replaces a less reactive element
fluorine = pale yellow gas
chlorine = yellow-green gas
bromine = reddish-brown liquid
iodine = black solid
group 0 (changes down the group)
- unreactive (full valence shell)
- low mp and bp
transition elements
- mp is generally high
- high density
- hard & strong metals
- not very reactive
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