1. Noble Gas Notation A shorthand method of writing electron configuration

2. Noble Gases   group 18 elements  Noble gas configuration  the outer main energy level is fully occupied by 8 electrons

3. Steps to Write a Noble Gas Notation  write down the symbol of the preceding noble gas (last column)  Draw brackets around the noble gas symbol like this [Ne]  write the electron configuration starting from there

4. Practice  Write the noble gas notation for Ca  The preceding noble gas is Ar  Use the periodic table to find the next principal quantum number  [Ar] 4s 2

5. Additional Practice  Write the noble gas notation for Zr  The preceding noble gas is Kr  [Kr] 5s 2 4d 2  Write the noble gas notation for Ni  The preceding noble gas is [Ar]  [Ar] 4s 2 3d 8