p block Flashcards
what is group oxidation state
total valence elctrons donated state
which elements are stable in group oxdation stae
lightee elements of b,c,n families
inert pair effect
down the group the oxdn stae with two units less gets more stable
the heaviest metal of p block is the most non metallic T/F
False its the most metallic
p block elements and pi bonds
first elements of the group show p pi bonds with each other and itself and heavier dont form p- pibonds but d pi and d-p pi but the bonds are not as stble as pp pibond
orthoboric acid
H3BO3
differnce in borax and kernite water of hydration
4(10-6)
size of group 13
B< G <Al In<Tl
physical properties of group 13
B is hrad and has highest melting point and boiling point ,galium has highest boiling point all metals are soft and density increases down the group
nature of oxides of grp 13
B203-Acidic,Al2O3,Ga2O3-Amphoteric,In2O3,Tl2O3-basic
uses of B
isotope of B (atomic mass=10) can absorb neutrons therefore used in nuclear stuff,als used to mak ehet resistant glasses
on a weight to weight to weight basis Al is more conductive than Cu T/F
TRUE
ionisation enthalpy of grp 14
C>Si>Ge>Pb>Sn
ELECTRONEGATIVITY OF GRP 14
more electronegative than grp 13 and decreases for Si and remains the same till Sn and icnreases for Pb
nature of oxides
CO2,SiO2,GeO2 are acidic,SnO2,PbO2 are amphoteric
preferable oxidation staes of elements in grp 14
C,Si,Ge prefer +4 while Sn,Pb prefers +2
halides which are ionic in grp 14
lead and tin terahalides
reason for catenation of carbon
high bond enthalpy
crystaline from of carbon
diamond and graphite
diamond explain
crystaline,sp3 hybradised
graphite explain
layered structure with sp2 hyb and foruth electeon delocalises between the the layers(340pm),its slippery and is useda s lubricant and is good conductor
fullerene explain
electocuting graphite,sp2 hyb,C60 is buckmiinster fullerene,aromatic
