Here's how to determine the noble gas notation for berkelium (Bk):

1. Find the atomic number of the element.

* Berkelium (Bk) has an atomic number of 97. This means it has 97 protons and 97 electrons.

2. Find the noble gas that comes before the element in the periodic table.

* The noble gas that comes before berkelium is radon (Rn), which has an atomic number of 86.

3. Write the noble gas symbol in brackets.

* [Rn]

4. Determine the remaining electron configuration.

* Berkelium is in the actinide series, meaning it fills its 5f orbitals. The electron configuration after Radon is:

* 5f⁹ 7s²

5. Combine the noble gas symbol and the remaining electron configuration.

* The noble gas notation for Bk is [Rn] 5f⁹ 7s²