The dand fblock elements - Result Question 83
####83. Actinides
[1994]
(a) Are all synthetic elements
(b) Include element 104
(c) Have any short lived isotopes
(d) Have variable valency
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Solution:
- (d) Actinides have variable valency due to very small difference in energies of $5 f, 6 d$ and $7 s$ orbitals. Actinides are the elements from atomic number 89 to 103.
