f block Flashcards
last electron enters to(f block)?
[(n-2)f]
no.of orbitals contained by f subshell?
7
general outermost electronic configuration and its 3 valence subshells?
[noble gas] (n-2)f^1-14 (n-1)d^0 or1 ns^2
- (n-2)f,(n-2)d,ns
why f block elements are known as inner transition elements/metals?
since in f block elements a transition within the transition occurs.
rare earth is also known as….
lanthanoids
La(57) and f block elements following it is from which grp and which period?
3rd group and 6th period
after La(57)…..third grp ki EC
Ce(58)………Lu(71)
……….1-14 0 or 1 2
[Xe]4f 5d 6s
what are actinones/actinoids?
14 elements coming after Ac(89)
Th(90)……………Lr(103)
general EC of actionoids?
………..1-14 0 or 1 2
[Rn] 5f 6d 7s
actionoids belongs to?
7th period and 3rd grp
which is the only radioactive lanthanoid?
Promethium (Pm) 61
most of the actinoids are…
radioactive
non radioactive actinoids are?
Th(90) , Pa(91) , U(92)
11 elements are known as trans uranium elements/man-made elements/synthetic elements.which are they?
they are actinoids. from Np(93) to Lr(103).
Np,Pu,Am,Cm,Bk,Cf,Es,Fm,Md,No,Lr.
ec of La
……….1 2
[Xe]5d 6s
EC of Ce(58)
………..1 1 2
[Xe] 4f 5d 6s
EC of Gd(64)
………7 1 2
[Xe]4f 5d 6s
who have 8 unpaired electron?
Gd
Lu(71)
………14 1 2
[Xe]4f 5d 6s
Tm(69)
thulium
……… 13 2
[Xe]4f 6s
most abundant lanthanoid
Ce(58)
who have high ionisation enthalpy among lanthanoid and actinoid?
lanthanoid
magnetic moment of lanthanoids have contributions from..
spin magnetic moment and orbital magnetic moment
who have the highest magnetic moment?
Nd(60)
[xe] 4f(4) 6s(2)
mag.moment of Ln is contrubuted by?
spin mag.moment
who have higher effective nuclear charge?why?
actinoids.
since nuclear-electron attraction is greater and atomic/ionic radius is smaller.e/m ratio of actinoids is higher.
actinoids form stable complexes with…
EDTA , diketones, oxine and with pi acceptor acide ligands(CO)
lanthanoid contraction
due to poor shielding effect of 4f (La to Lu)
certain pair of elements( in 2nd and 3rd transition series) have similar atomic and ionic radii and so similar chemical properties and always occur together in nature
Zr(160pm)
Hf (159 pm)
