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chemistry P2 (group 7-halogens (low melting points, low boiling points,…
chemistry P2
group 7-halogens
low melting points
low boiling points
toxic
non metal
coloured vapours
7 electrons in outer most shell
elements get less reactive going down the group
all react with metals
group 1(Alkali metals)
they have 1 electron in the outer shell
they will lose there outer shell electrons when they react
they will have a +1 charge when they react
It will lose this outer electron to give it a full outer shell
properties
soft and get softer as you go down the group
solid at room temperature
shiny
will conduct heat and electricity
melting point lower than normal metal
decreases as you down the group
metals and non metals
elements that form positive ions are metals
Elements that form negative ions are non-metals
there are more metals in the periodic table than non-metals
metal properties
solid
malleable
shiny(when polished)
meting point decreases as you go down the group
conduct electricity/heat
low density(for the first three)-float
transition elements/transition metals
central block of periodic table
physical properties
hard and strong
high densities
good conductors of electricity and thermal energy
high melting points
one exception
much less reactive compared to group 1
name of a compound with transition elements usually include a roman numeral