Element X exhibits the following properties:
• Atomic radius: 152 pm
• First ionization energy: 520 kJ·mol⁻¹
• Second ionization energy: 7 300 kJ·mol⁻¹
• Electron affinity: −60 kJ·mol⁻¹
• Ionic radius of its most common cation: 76 pm
Using these data, which element is X most likely to be?
a) Mg
b) Li
c) Be
d) Na