topic 4 Flashcards
what are the properties of the group 1 metals?
they’re soft and they have low melting points
why are group 1 metals different to other metals?
they have low melting points compared with other metals and they are very soft (can be cut with a knife)
do group 1 elements react vigorously in water?
yes
what happens as you go down group 1?
the attraction between the positively charged nucleus and the negatively charged electron decreases which means the electron is easier to get rid of
the elements further down group 1 are…
more reactive
do elements get more reactive as the atomic number increases?
yes
what are the group 1 metals called?
alkali metals
what does a reaction with water and an alkali metal produce?
hydrogen gas
what causes fizzing to take place in a reaction
water reacting with the alkali metal producing hydrogen
what experiment can you do to show whether hydrogen is present?
a lighted splint which will make a “squeaky pop” sound as the hydrogen ignites
what are the group 7 elements known as?
the halogens
how many electrons do the happens have in there outer shell?
7
when halogens react with metals what do they form?
metal halides
is a metal halide a salt?
yes
will more or less reactive halogens replace more or less reactive ones?
more reactive halogens will displace the less reactive one
the more reactive halogens are higher/lower
higher
why are halogens higher up group 7 more reactive?
there outer shell is closer to the nucleus so the pull from the positive nucleus is greater which attracts more electrons more strongly
what happens when ha life’s dissolve in water?
the halide ions are free to react
what is a displacement reaction?
when a more reactive halogens reacts with a solution that contains halide ions which will “push out” (displace) the less reactive halogen
give an example of a displacement reaction
chlorine is more reactive than iodine ( it’s higher up group 7). therefore, chlorine reacts with potassium iodine to form potassium chloride and iodine
what are group 0 elements called?
the Nobel gases
do Nobel gases react with a lot?why?
no because they have a full outer shell so they aren’t desperate to gain or loose electrons
are the Nobel gases flammable?why?
no because they are inert
what is argon used for? (Nobel gases)
to provide an inert atmosphere in filament lamps because Nobel gases are non-flammable so it stops the very hot filament from brining away
