General Chemistry Study Guide: Periodic Trends, Lewis Structures, Molecular Geometry, and Bonding

Magnesium (Mg) has an atomic number of 12. How many core electrons and valence electrons does Mg have, and what is its effective nuclear charge ($Z_{eff}$) for a valence electron? Use the formula $Z_{eff} = Z - S$, where $Z$ is the atomic number and $S$ is the number of core electrons.

Rank the following ions from smallest to largest atomic radius: $F^-$, $F^+$, $F$.

Given the following ionization energies for an unknown element: $IE_1 = 1,086$ kJ/mol, $IE_2 = 2,352$ kJ/mol, $IE_3 = 4,629$ kJ/mol, $IE_4 = 6,221$ kJ/mol, $IE_5 = 37,820$ kJ/mol, $IE_6 = 47,260$ kJ/mol. How many valence electrons does this element have?