Why are there 10 elements in each series of d-block?


As the d-subshell can have a maximum of ten electrons.

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In terms of electronic configuration,
what is common in a given period and group?


For elements in a period, the number of shells is equal.
For elements in a group, the number of electrons in the outermost shell is the same.
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Give the general electronic configuration of
(i) Transition elements     (ii) Inner transition elements.


(i) Transition elements:
     (n - 1)d1-10  ns1-2.

(ii) Inner transition elements:
      (n - 2)f1-14   (n - 1)d0-1  ns2.

Tips: -

 
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To which block the element with outer electronic configuration 4s23d10 belongs?


d-block.
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Name the group and period to which an element with Z = 15 belongs ?


Element (Z = 15) = 1s22s22p63s23p3.  It belongs to 3rd period and group 15.
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