What is the noble gas notation for the electron configuration of Se?

The noble gas notation for the electron configuration of selenium (Se) is [Ar] 4s² 3d¹⁰ 4p⁴.

To break it down:

• Selenium has an atomic number of 34, meaning it has 34 electrons.
• The noble gas preceding selenium in the periodic table is argon (Ar), which has the atomic number of 18. This means we can start the electron configuration from argon.
• After argon, selenium continues filling the 4s and 3d orbitals before finishing with the 4p orbital. Specifically, selenium will fill the 4s orbital with 2 electrons, the 3d orbital with 10 electrons, and finally the 4p orbital with 4 electrons.

This notation is a concise way of representing the electron configuration and highlights the stable electron configuration of the noble gas that precedes selenium.