Q.

The location of an element in the periodic table reflects

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a

elecrronic configuration

b

quantum numbers of the last orbital being filled

c

Orientation of orbitals of the valence shell

d

none of the above

answer is B.

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Detailed Solution

Example: Na (Z = 11) has electronic configuration 1s22s22p63s1. The last orbital stands as 3s1 which is related to position of sodium in periodic table as: 3rd period, s-block and 1st group.
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The location of an element in the periodic table reflects