1. Tardigrade
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  3. Chemistry
  4. Among the elements with atomic numbers 9, 12, 16 and 36 which is highly electropositive?

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Q. Among the elements with atomic numbers $9$, $12$, $16$ and $36$ which is highly electropositive?

Classification of Elements and Periodicity in Properties

Solution:

$Z = 9$; $1s^2\, 2s^2\, 2p^5$
$Z = 12$; $1s^2\, 2s^2\, 2p^6\,3s^s$
$Z = 16$; $1s^2\, 2s^2\, 2p^6\,3p^4$
$Z = 36$; $1s^2\, 2s^2\, 2p^6\,3s^2\, 3p^6\, 3d^{10}\, 4s^2\, 4p^6$
Electropositivity decreases along the period while it increases going down the group.