OCR AS Chemistry Revision

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2n2
s 2
p 6
d 10
f 14
1s2
2 el
ect
rons
2s2 2p6
8 el
ect
rons
3s2 3p6 3d10
18
elect
rons
4s2 4p6 4d10 4f14
32
elect
rons
Particle Relative Mass Relative Charge
Pr
oton 1 1+
Neut
ron 1 0
El
ect
ron 1/
2000 1
Atoms are neutral as they have the same number of protons and electrons
"Isotopes are atoms of the same element with the same number
of protons and electrons but different numbers of neutrons"
Na
(g)
Na
+ (
g)
+ e
First ionisation energy
is
the
energy
requi
red
to
remove
one el
ect
ron
fr
om
one
mol
e of
gaseous
atoms
to
for
m one
mole
of
gaseous
1+ i
ons.
Factors affecting ionisation Energy
Atomic Radius
Mor
e s
h el
l
s,
l
e ss
at
tr
act
ive
for
ce bet
w een
nucl
eus
and
elect
rons
as
fur
ther
away,
r
esul
ti
ng i
n a
lower
I.
E.
Electron Shielding Mor
e i
nner
shel
ls
and el
ectr
ons
are
a "
barr
ier
"
bet
w een
nucl
eus
and
o ut
er
she l
ls,
l
ess
nucl
ear
at
tr
acti
on bet
we en
nucl
eus
and out
er
shel
l
s,
lower
I
.E.

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Page 2

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Nuclear Charge
More
prot
ons,
more
nuclear
char
ge & gr
eater
att
ract
i
ve
for
ce
bet
ween
el
ect
rons
and
nucleus
resul
ti
ng i
n a
higher
I
.E.…read more

Page 3

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OILRI
G
Oxidising agents
acc
e pt
el
ect
rons
fr
om
react
ant
s
Reducing agents
donat
e el
ect
rons
to
a r
eagent
Acids
are
prot
on
donor
s
Ch3cooh
H2so4
Hcl
Hno3
HCl
+
aq
H+
+ Cl
Bases acc
e pt
pr
otons
MgO
NH3
Alkalis
are
sol
ubl
e bases
NH3
NaOH
NaOH
+ aq
Na+
+ OH
Neutralisation:
H+
+ OH
H2O
Aci
d +
Base
Wat
er
+ Sal
t
Aci
d +
Alk
a l
i…read more

Page 4

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Met
all
i
c met
al
+ met
al
Anionic bond
i
s t
he
elect
rost
ati
c
att
ract
i
o n
bet
ween
opposi
t
e l
y
char
ged
ions
Acovalent bond
i
s a
bond
for
med
bet
ween
a s
h ar
ed
pai
r
of
elect
rons
Ametallic bond
i
s t
he
elect
rost
ati
c
att
ract
i
o n
between
a posi
t
ive
met
al
i
o n
and
a del
ocal
i
sed…read more

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