Question

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

• A. Element with atomic number 9
• B. Element with atomic number 12
• C. Element with atomic number 16
• D. Element with atomic number 36

Answer 1

Answer: (B)

Element with atomic number 12

Answer 2

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