Quiz 10 Name(s):

Recall that the energy of a hydrogenic atom is given by the formula

where . In this formula, Z is the nuclear charge. However, in a multielectron atom, the nuclear charge is partially screened by the other electrons. Note also that the ionization energy of a multielectron atom is the energy required to remove an electron from the highest occupied orbital when the atom is in its ground state. If the ionization energy of sodium is , what is the effective nuclear charge experienced by the valence electron? Does the effective nuclear charge you compute make sense? Explain briefly.

Sodium is element number 11 and is the first element in the third row of the periodic table.