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SSC CHSL 2023 PYQ — Question 42

SSC CHSL - 10 Aug 2023 - Shift 3 • General Awareness • Q42

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In which group of the Periodic Table will you put the elements with electronic configuration [He]2s22p6?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 18.

Elements with the electronic configuration [He]2s22p6, which is equivalent to 1s2 2s2 2p6, belong to Group 18 (also known as the noble gases) of the Periodic Table. This configuration corresponds to the element Neon (Ne).

  • Understanding the Configuration:  [He]2s22p6 indicates that the element has filled s and p orbitals in the second energy level (n=2) after the core configuration of Helium (1s2 or [He]). 
  • Group 18 (Noble Gases): Elements in Group 18, also known as noble gases, have a full outer electron shell (octet rule) and are generally unreactive. 
  • Neon (Ne): The electronic configuration 1s2 2s2 2p6 corresponds to the element Neon (Ne), which has an atomic number of 10. 
  • Period: The element is in the second period (2nd row) of the periodic table, as indicated by the '2' in 2s2 and 2p6.