Relative number of electrons
208
18.7 13.5
1.95 1.01
E (MJ/mol)
1. Identify the element whose PES spectrum is shown and write the appropriate electron configuration for
that element.
2. **Which peak represents the 2s subshell? Explain.
3. **An electron from which peak represents the first ionization energy of the atom? Explain.
**How many valence electrons does this atom have?_
*Circle the peak in the spectrum for electrons that are experiencing the strongest coulombic"
