1. Find beryllium on the periodic table. It's in the second row (period 2).
2. Identify the noble gas that comes before beryllium. That's helium (He).
3. Write the symbol for the noble gas in brackets. This represents the core electrons of beryllium. So, we have [He].
4. Determine the remaining electron configuration. Beryllium has an atomic number of 4, meaning it has 4 electrons. Helium has 2 electrons. This leaves us with 2 more electrons.
5. Add the remaining electrons to the noble gas notation. Beryllium's configuration is 2s².
Therefore, the noble gas notation for beryllium is [He] 2s².
