Which element has the highest first ionization energy?

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Question: Which element has the highest first ionization energy?

Options:

Correct Answer: Helium

Solution:

Helium has the highest first ionization energy due to its small size and high effective nuclear charge.

Which element has the highest first ionization energy?

Which element has the highest first ionization energy?

Step 1: Understand what ionization energy is. It is the energy required to remove an electron from an atom.
Step 2: Know that the first ionization energy refers to the energy needed to remove the first electron.
Step 3: Recognize that smaller atoms generally have higher ionization energies because their electrons are closer to the nucleus.
Step 4: Learn that effective nuclear charge is the net positive charge experienced by an electron in an atom. Higher effective nuclear charge means a stronger attraction to the nucleus.
Step 5: Identify helium (He) as the element with the smallest atomic size and the highest effective nuclear charge among all elements.
Step 6: Conclude that helium has the highest first ionization energy because it is small and has a strong attraction to its electrons.

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