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(B) To determine the highest sum,we evaluate the ionization energies $(IE)$: $1$. $IE_1$ of $He$ is very high $(2372 \ kJ/mol)$. $2$. $IE_2$ of $Li$ i

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$IE_1$ of $He$,$IE_2$ of $Li$,$IE_3$ of $Mg$

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(B) To determine the highest sum,we evaluate the ionization energies $(IE)$: $1$. $IE_1$ of $He$ is very high $(2372 \ kJ/mol)$. $2$. $IE_2$ of $Li$ is very high $(7298 \ kJ/mol)$ because it involves removing an electron from a stable $1s^2$ configuration. $3$. $IE_3$ of $Mg$ is also very high $(7733 \ kJ/mol)$ as it involves removing an electron from a stable $2p^6$ configuration. Comparing the sets: Set $A$: $IE_1(He) + IE_2(Li) + IE_2(Ca) = 2372 + 7298 + 1145 = 10815 \ kJ/mol$. Set $B$: $IE_1(He) + IE_2(Li) + IE_3(Mg) = 2372 + 7298 + 7733 = 17403 \ kJ/mol$. Set $C$: $IE_1(Li) + IE_1(He) + IE_1(K) = 520 + 2372 + 419 = 3311 \ kJ/mol$. Set $D$: $IE_2(Na) + IE_2(Ba) + IE_2(Sr) = 4562 + 965 + 1064 = 6591 \ kJ/mol$. Thus,Set $B$ has the highest sum.

Which of the following sets has the highest sum of $IE$ values compared to all other sets mentioned?

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