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Which element has the highest first ionization energy?

A:

Quick Answer

The element that has the highest first ionization energy is helium. The first ionization energy represents the amount of energy needed to make an atom into a positive ion, which is called a cation.

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Which element has the highest first ionization energy?
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Full Answer

As the number of protons in the nucleus increases, the ionization energy increases as well; therefore, the ionization energy increases from left to right across the periodic table. Another trend with ionization energy is that it increases from the bottom to the top of the periodic table, because the closer to the nucleus the electron orbits, the harder it becomes to rip the electron from its orbital. As it sits at the top right of the periodic table, helium naturally has the highest first ionization energy.

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Related Questions

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    What is the definition of "ionization energy"?

    A:

    The ionization energy of an element is the amount of energy needed to rip an electron from an atom in the gaseous state. The ionization energy increases going up and to the right of the periodic table.

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    What is the trend of the first ionization energy down a group?

    A:

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    Why do elements give off color when heated?

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    Which phase change involves the absorption of heat?

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