Final answer:
The abbreviated electron configuration for fluorine is [He]2s²2p⁵, using the helium core to represent the complete 1s orbital.
Step-by-step explanation:
The abbreviated electron configuration of fluorine (F), which has an atomic number of 9, can be written using the inert gas preceding it in the periodic table. The full electron configuration of fluorine is 1s²2s²2p⁵, and since the first two energy levels (1s) are filled just like in helium (He), the abbreviated configuration uses the [He] symbol to represent those core electrons. Therefore, the abbreviated electron configuration for fluorine is [He]2s²2p⁵.
Fluorine belongs to the second period in the periodic table, meaning the first energy level is already filled similarly to helium. By using the noble gas shorthand notation, we replace the 1s² electrons with the helium core, simplifying the configuration. This shortcut is beneficial for representing the electron configuration of elements quickly and concisely.