List in order of increasing ionization energy: Na,K,F,Mg,Ne.
A)Na

Question

List in order of increasing ionization energy: Na,K,F,Mg,Ne.
A)Na < K < F < Ne < Mg
B)K < Na < Mg < F < Ne
C)Ne < Mg < F < K < Na
D)F < Mg < Ne < K < Na
E)Ne < Na < Mg < F < K

Quizplus · Accepted Answer

Ionization energy generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table. Thus, K (being lower than Na in the same group) has the lowest ionization energy, followed by Na, then Mg (as we move to the right in the same period, ionization energy increases), then F (further right in the same period, hence higher ionization energy), and finally Ne (being a noble gas with a full outer shell, it has the highest ionization energy in the given group).

List in Order of Increasing Ionization Energy: Na,K,F,Mg,Ne