Short Answer Type
Long Answer TypeShort Answer TypeLong Answer TypeShort Answer TypeLanthanoides and actinodes are placed in separate rows at the bottom of the periodic table. Explain the reason for this arrangement.
In lanthanoids (58Ce to 71Lu) 4f-subshell is being filled and in actinides (90Th to103Lr), 5f-subshell is being filled. All the 14 lanthanoids and all the 14 actinoids have similar properties. They have been placed at the bottom of the periodic table in two separate horizontal rows because of the following reasons:
(i) to save space,
(ii) to keep the elements having similar properties in a single column,
(iii) to avoid undue sidewise expansion of the periodic table.
Long Answer TypeShort Answer TypeName the block to which the elements with following valence shell electronic configurations belong:
(i) 3s2 3p5
(ii) 3d104s2
(iii) 3p64s2
(iv) 6s2 4f0
(v) 4s1 3d5
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