1. Find Zirconium's Atomic Number: Zirconium has an atomic number of 40, meaning it has 40 protons and 40 electrons.
2. Identify the Preceding Noble Gas: The noble gas that comes before zirconium on the periodic table is krypton (Kr), which has an atomic number of 36.
3. Write the Noble Gas Symbol: Begin the notation with the symbol of the preceding noble gas in square brackets: [Kr]
4. Add the Remaining Electrons: Zirconium has 4 more electrons than krypton. These are the electrons in the 5th energy level:
* 5s² (2 electrons in the 5s orbital)
* 4d² (2 electrons in the 4d orbital)
5. Complete the Notation: The noble gas notation for zirconium is [Kr] 5s² 4d².
