मराठी

Electric Configurations of Elements and the Periodic Table

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Electric Configurations of Elements and the Periodic Table

  • Electronic configuration determines the position of an element in the periodic table.
  • Elements in the same group have similar valence-shell configurations.
  • Similar valence-shell configurations give similar chemical properties.
  • The period number is determined by the highest principal quantum number n present.
  • The block is determined by the subshell that receives the last electron.

General electronic configurations:

  • s-block: ns1 or ns2
  • p-block: ns2np1 to ns2np6
  • d-block: (n−1)d1−10ns0−2
  • f-block: (n−2)f1−14(n−1)d0−1ns2
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