Which of the following elements can form compounds with an expanded octet?
A)Se
B)C
C)Li
D)F
E)All of the above elements can form compounds with an expanded octet.

Question

Quizplus · Accepted Answer

Only elements from the third period onwards (such as Se) can form compounds with an expanded octet. This is because these elements have vacant d-orbitals in their valence shell, which can participate in bonding and accommodate extra electrons. Elements in the first and second periods (such as C, Li, and F) do not have d-orbitals in their valence shell and are therefore limited to an octet.

Which of the Following Elements Can Form Compounds with an Expanded