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What element has the highest first ionization energy?

Answer 1

Natalie Anton

Well, elemental ionization energies INCREASE across a Period, and DECREASE DOWN a Group....

And clearly, this is in relation to the Periodic Table as we face it....

And by these criteria the element with the highest first ionization energy is HELIUM...

And we refer to the transition....

#M(g) + Delta rarrM^+(g) + e^(-)(g)#

But as chemists, as physical scientists, we SHOULD always interrogate the data...

I hope you can see the data here, because I cannot, even with spex on! Do the data support our argument. Why or why not?

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Answer 2

Peyton Adams

The element with the highest first ionization energy is helium.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.