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Summary GCSE chemistry paper 1
In depth GCSE notes including all key information and potential exam help with diagrams, definitions etc.
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Chemistry paper oneChemA periodic table and elements
elements
anelementismadeupof onetypeofan atom
eachelementismadeupof differentatoms
Dyfi eg mm n mymadeup of Cnn atoms
Iffy
compounds
madeup atatomsof two or more delleventelements bondedtogether
eg H2O H
H
molecules Periodical
group of two or modernperiodictableare
ordered
moreatomsjoined byincreasingatomicnumber
together are calledmolecules
t
egNH3 N N position in the periodic tabletells
you theelectronicstructure
16 Massnumber protons neutra groupnumber specifiesthenumber
0 ofelectrons in theoutershell
atomicnumberProton
egoxygen
x o X
E8ÉTJ
nucleus
jo xx
neutron neutral0 period number thenumberofshells with
, neutron neural per thenumberofshells with
proton positive t I electrons in
electron negative 1 ISOTOPE anelement with thesamenumber of
protons but a differentnumber ofneutrons
Do I 7 8
GroupO elements
Li Li
noblegases 3 3
theboilingpointincreases
asyou
godowngroup0 to
Group7 elements
nonmetals with fulloutershells called halogens
theyare stable sounreactive non metals
colourless ases at roomtemperature Asyougodown
reactivity decreases
proenne yellow 90 melting boilingpoint to increases
chlorine'sdensegreengas maturemolecularmass undead
bromine volatilebrainliquid
Iodine darkgreysolid or Oh Group I elements
Pimplevapour alkali metals
reactuity asyougodownincreases
elements meltingpointdecreases
hd relativeatomicmass increases
eveygroup 1 elementshave 1 outershell
Arosa_
onetypeofatomonly the development of the model
of the atom
COMPOUND first atomsbeloved to be tinyspheres that
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