One method for calculating `Z_(eff)` is to use the equation:
`Z_(eff) = sqrt(((E)(n^(2)))/(1312kJ//"mole"))`
where E is the energy necessary to remove an electron from an atom and n is the principal quantum number of the electron. Use this equation to calculare `Z_(eff)` value for the highest energetic electron in potassium. `E = 418.8 kJ//"mole"`
A. `2.86`
B. `2.26`
C. `3.26`
D. `2.00`