Question

in which orbitals would the valence electrons for selenium (se) be placed?
○ s orbital and f orbital
○ s orbital only
○ s orbital and p orbital
○ d orbital only

Explanation:

Step1: Locate Se on periodic table

Selenium (Se) is atomic number 34, in period 4, group 16.

Step2: Write electron configuration

Electron configuration: $1s^22[Client Connection Error]s^22p^63s^23p^63d^{10}4s^24p^4$

Step3: Identify valence electrons

Valence electrons are in the highest energy level (n=4): $4s^24p^4$. These occupy s and p orbitals.

Answer:

s orbital and p orbital