d block Flashcards
where is the last differentiating electron accommodated in d block elements?
Penultimate shell = the shell just before the valence shell
define transition elements
elements who have partially filled n-1 d orbitals of n-1 main shell ,in both their atomic and common oxidation state are transition elements
comment 1st series
3 d series
4th period
scandium 21 to zinc 30
comment 2nd series
4 d series
5th period
yttrium 39 to cadmium 48
comment 3rd series
5 d series
6th period
lanthanum 57 + hafnium 72 to mercury 80
list the elements with irregular configuration
chromium, copper, niobium, molybdenum, ruthenium, rhodium, palladium, silver, platinum, gold
list the elements whose irregularities are explained on the basis of the concept of half and fully filled orbitals .
cr cu mo pd au ag
the properties of d block elements of any given period are not much different from one another as those of the same period of non transition elements because?
in transition series, there is no change in number of electrons of the outermost shell and only change occur in (n-1)d electron from member to member in a period.
why are d block elements metals
because they have 1 or 2 e in the valence shell
which group elements are most ductile and soft
group I B ( 11th group ) - copper silver gold
they are all hard malleable and ductile except
mercury Hg
why are they good conductors of heat and electricity
free e
___ is most conductive
I B
order of conductivity in I B
silver>copper>gold>Aluminium
why does it favour both covalent and ionic bonding
covalent: unfilled d subshell
ionic: 1 or 2 e in valence shell
