Question

1. which element has the highest ionization energy in period 3 of the periodic table? chlorine (cl) aluminum (al) magnesium (mg) sodium (na)

Explanation:

Ionization energy increases across a period from left - to - right in the periodic table due to increasing nuclear charge and decreasing atomic radius. Chlorine is the right - most element among the given options in Period 3, so it has the highest ionization energy among them.

Answer:

Chlorine (Cl)