Summary Unit 3.2.2. - group 2, the alkaline earth metals

ALKALINE EARTH
-




s block -
s -

sub shell full
My Ba
-

→




trends in 62 :




atomic radius nuclear charge
increases down 62 increases down 62
I, extra principal energy levels added
↳ outer e- further from nucleus


ionisation
energy
attraction nucleus & i Ngl Xtlglt
-




dneerneadens down 62 weaker force of → e

-



more principal energy levels € more

less
shielding -




required to
further from nucleus

remove e
-
SH t ISH -




kendo bexol release)
energy
melting point
dneereansens down 62
-

metallic bonds =
weaker as the size of ions increases down 62
T but number of delocalised charge All
-




size
-


same
-



e same
i
= -




distance ① metal ions & de localised -0 of El nucleus LARGER
-


-

:
sea
=
e

↳ weaker attraction break bonds
energy required
to less lower NPT
easy
=
-

. -




reaction with tho

Ngl ) s t 2h20 Cg) >
My Old t th Ig) reactivity
Ca ( OH) Is) )
Ca ( s) t
21-12061 →
,
t
Haly increases
mmmm
down 62

Sr ( s) 21-12061 Sr ( Ot Dds) Haly) T
shielding by
-




t → t
inner e
-
-




Ba ( s) t
21-12061 → Bala Dds) -
t
Haly) -


less force of attraction -

easier loss

Mglsl t IH Ill →
Mg (OHH ( ) s t
thlgl -
AR increases


Mglotthlsl
"

Mg ( agl 2 OH
-




→
t




EXTRACTION OF TITANIUM Titanium ore (ti Od
Ti
expensive strong
-




;

-




complicated extraction Tik + C t 2 Ck s
Tilly t Ah
batch process ① heated with C and a
gas
-




-



non -

corrosive ① fractional distillation :
pure till, Tilly t 1 My → Ti t
Inga ,


③ t
Ng 110009