Which element has the largest ionization energy?

Understand the Problem

The question is asking to identify the chemical element that has the highest ionization energy, which is the energy required to remove the outermost electron from a gaseous atom of that element. This typically involves knowledge of the periodic table and the general trends in ionization energy across different elements.

Answer

Helium (He)

The element with the largest ionization energy is Helium (He).

Answer for screen readers

The element with the largest ionization energy is Helium (He).

More Information

Helium has the largest ionization energy because it has a small atomic radius and a high effective nuclear charge, which means that the electrons are held very tightly by the nucleus.

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