Chemistry · Ch 7 — Elements of Groups 16, 17 and 18

Electronic configuration of elements of group 16, 17 and 18

7.3

Electronic configuration of elements of group 16, 17 and 18

Note

The book prints this heading with a stray double colon — "7.3 Electronic configuration of elements of group 16, 17 and 18: :" — reproduced here as a note rather than in the title.

The general electronic configuration of the group 16 elements is $\mathrm{ns^2np^4}$ , while that of the group 17 elements is $\mathrm{ns^2np^5}$ . The group 18 elements are represented by the $\mathrm{ns^2np^6}$ configuration. The elements of groups 16 and 17 respectively have two and one electrons less than the stable electronic configuration of the nearest noble gas.

Table 7.1 shows the condensed electronic configuration of the elements of groups 16, 17 and 18.

Table 7.1 : Condensed electronic configuration of elements of group 16, 17 and 18

Group 16 (Oxygen family) — Element	Condensed Electronic Configuration	Group 17 (Halogen family) — Element	Condensed Electronic Configuration	Group 18 (Noble gases) — Element	Condensed Electronic Configuration
				$_{2}$ He	$\mathrm{1s^2}$
$_{8}$ O	$\mathrm{[He]2s^22p^4}$	$_{9}$ F	$\mathrm{[He]2s^22p^5}$	$_{10}$ Ne	$\mathrm{[He]2s^22p^6}$
$_{16}$ S	$\mathrm{[Ne]3s^23p^4}$	$_{17}$ Cl	$\mathrm{[Ne]3s^23p^5}$	$_{18}$ Ar	$\mathrm{[Ne]3s^23p^6}$
$_{34}$ Se	$\mathrm{[Ar]3d^{10}4s^24p^4}$	$_{35}$ Br	$\mathrm{[Ar]3d^{10}4s^24p^5}$	$_{36}$ Kr	$\mathrm{[Ar]3d^{10}4s^24p^6}$
$_{52}$ Te	$\mathrm{[Kr]4d^{10}5s^25p^4}$	$_{53}$ I	$\mathrm{[Kr]4d^{10}5s^25p^5}$	$_{54}$ Xe	$\mathrm{[Kr]4d^{10}5s^25p^6}$

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