1. Find Technetium's Atomic Number:
* Technetium has an atomic number of 43. This means it has 43 protons and 43 electrons.
2. Identify the Preceding Noble Gas:
* The noble gas that comes before technetium on the periodic table is krypton (Kr), which has an atomic number of 36.
3. Determine the Remaining Electrons:
* Technetium has 43 electrons, and krypton has 36. Subtract krypton's electrons from technetium's: 43 - 36 = 7. This means there are 7 electrons beyond krypton's configuration.
4. Write the Noble Gas Configuration:
* The noble gas configuration of technetium is: [Kr] 5s² 4d⁵
Explanation of the Configuration:
* [Kr]: This represents the electron configuration of krypton, which is a stable and filled shell.
* 5s²: Two electrons occupy the 5s subshell.
* 4d⁵: Five electrons occupy the 4d subshell.
