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describe fluorine
very reactive, poisonous orange gas
describe chlorine
reactive poisonous yellow gas
describe bromine
ready brown volatile, poisonous liquid
describe iodine
dark grey,volatile solid can form poisonous purple vapours(also an antiseptic)
does the melting and boiling point increase or decrease as u go down group 7?
increases
Does reactivity increase or decrease as you go down group 7?
decreases
what colour is chlorine water?
colourless
what colour is iodine water?
brown
what colour is bromine water?
orange
how do displacement reaction work with halogens?
more reactive halogens will always displace less reactive ones
why is chlorine less reactive than fluorine despite having an increased nuclear charge?
the increased nuclear charge going down the group(which helps an atom attract an incoming electron) is outweighed by the effect of increased distance and shielding by more inner electrons/shells
what happens to the names of halogens when they gain an electron to form a 1- ion?
we call it a halide so the endings of the halogens change to end in ''de''
What do halogens exist as?
diatomic molecules
how do halogens be diatomic?
by sharing electrons and forming a covalent bond
Why does reactivity decrease going down group seven?
as you go down the group the outermost shell gets farther and farther away from the nucleus, as the number of shells increases so the attractive force needed to pull in an extra electron from another atom gets weaker. also the increased number of shells causes shielding from the inner shells
Does boiling point increase or decrease down the noble gas group? Why?
increases as you go down group 0 as relative atomic mass size of atom increases so the nuclear charge is higher increasing the strength of the intermolecular forces so more energy is needed to overcome the intermolecular forces
What do noble gases exist as?
colourless gases and exist as single atoms
does the density increase or decrease as the size of the atom increases in group 0?
increases
are noble gases flammable?
No - they're non-flammable
