Why does the ionization energy generally decrease down a group in the periodic table?

Correct Answer: The outermost electrons are farther away from the nucleus

Subject: chemistry

• The innermost electrons are pulled closer to the nucleus
• The outermost electrons are farther away from the nucleus
• The elements become chemically inert
• The atomic mass significantly drops

Explanation: • <b>Key Fact</b> Ionization energy decreases down a group because outermost electrons are farther from the nucleus. • <b>Supporting Detail</b> Increased atomic radius and shielding effect reduce electrostatic attraction on valence electrons. • <b>Related Concept</b> Lower attraction means less energy is required to remove a valence electron. • <b>Why wrong options are wrong</b> Atomic mass increases down a group; inertness is not a general group property. • <b>Exam Trick</b> Distance increases ➔ Attraction decreases ➔ Easier to pull out electron. • <b>Additional Info</b> Helium has the highest ionization energy in the periodic table.

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