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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
Na Mg Al Si P S Cl Ar
M. Pt. /oC 98 650 660 1410 44 119 101 189
B. Pt.…read more

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
ELECTRONEGATIVITY
is a measure of the attraction of an atom in a molecule for the electron pair in the covalent bond of which it is a
part.
Variation of properties down a group and across a period
Electronegativity
I
n a
coval
ent
bond
b et
ween t
w o d i
ff
ere nt
atoms the at
oms
do
no t
a t
tr
act
the
elect
ro n
pai
r
in
the
bond
equal
ly
.…read more

Page 6

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
First Ionisation Energy Trends
The
first i
oni
sat
ion
ener
gy
for
an
element
i
s t
he
ener
gy
requi
red
to
remove
the
out
ermost
el
ect
ron
fr
om
a gaseous
atom,
t
hat
i
s t
he
ener
gy
for
t
he
pr
oce ss:
The
fu l
l
defi
n i
t
ion
is
: the energy required to remove one electron from each atom in one mole of gaseous atoms under…read more

Page 7

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
Down
any
group
in
the
Per
iodi
c Tabl
e t
he
ioni
sat
ion
ener
gy
decr
eases.
Thi
s c
a n
be
seen
in
the
graph.…read more

Page 8

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
Na t
o Ar
in
the
Per
iodi
c Tabl
e
i
s consi
dered:
The gener
al
tr
end
is
that
t
he
Ioni
sat
ion
ener
gy
incr
eases
fr
om
lef
t
to
ri
ght
acr
oss
a per
iod.…read more

Page 9

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
Atomic Radius
The
atomi
c r
adi
us
is
basi
cal
ly
used
to
descr
ibe
the
size
of
an
atom.
The
lar
ger
t
he
atomi
c r
adi
us,
t
he
lar
ger
t
he
atom.
The
atomi
c radi
us
is
usual
ly
taken
as hal
f
the
int
ernucl
ear
dist
ance i
n t
he el
ement
.…read more

Page 10

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A2 PERIODIC PATTERNS & TRENDS (Unit 5)
The
graph
shows
the
var
iat
ion
of
the
atomi
c r
adi
us
acr
oss
Per
iod
3 i
n t
he
Per
iodi
c Tabl
e.…read more

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