Question

helppppppppp 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

Answer 1

d orbital only because electronic configuration defines the block in which element is placed

Answer 2

Answer: Valence electrons of selenium will be placed in s and p-orbitals.

Explanation: Valence electrons are defined as the electrons present in the last shell of any element.

Selenium has an atomic number of 34.

Selenium is an element present in p-block.

Electronic configuration of Se = $[Ar]3d^{10}4s^24p^4$

Here, the last shell has n = 4.

Therefore, valence electrons of Selenium will be placed in s and p-orbitals.