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end of year chemistry
topic 2 periodic table
metals and non-metals
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Cards (20)
how is it organised now
in
increasing atomic number
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why do the groups of elements have similar reactivity
because they've all got the same number of
outermost electrons
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What charge does a group 1 ion have?
x+
when
x
is the element
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Metals form positive ions because;...
they want to
lose
electrons to form a
full outer shell.
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Non-metals form
negative
ions becuase...
they want to
gain
electrons to form a
full
outer shell
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the right side is...
non-metals
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the left side is
metals
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Most metal oxides...
are
basic
(pH of
8
or above)
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Most non-metal oxides are...
acidic
(pH of
6
or below)
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Are the boiling/melting points of metals high or low
high
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Are the boiling/melting points of non-metals high or low
low
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give some properties of metals
good conductors
of
heat
and electricity, shiny, ductile, high density, malleable.
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give some properties of non metals
bad conductors of
heat
and electricity, dull, low density,
brittle.
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noble gases described
Noble gases are
un-reactive
and do not easily form molecules because their atoms have stable arrangements of electrons (
full outer shells
)
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they exist as single or more than one atom
single
(
inert
)
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how were they shown in mendeleevs table
they
werent
because they hadnt been
discovered
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what was first to be discovered and what did it cause
helium
and because it was stable it didnt have
similarities
with other groups so it started a new group
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trends in group
0
the boiling point, density and RAM increases down the group. the atoms get larger meaning the
intermolecular
forces get stronger and require more
energy
to overcome.
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key facts
noble gases
are
colourless
unless excited
they are able to react but it is very
rare
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group 0 is also known as
the noble gases
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