Chemistry · Periodic Trends
The first ionization energy (IE1) decreases significantly from Ne to Ar in Group 18. Which combination of factors is primarily responsible for this decrease?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Increasing atomic number and decreasing nuclear charge
- 2Addition of the 3rd principal quantum shell increasing atomic radius, combined with 2p core shielding✓
- 3Presence of d-electrons in Ar reducing the ionization energy
- 4Stronger electron-electron repulsion in the 3p orbitals of Ar compared to 2p in Ne
Correct answer
Addition of the 3rd principal quantum shell increasing atomic radius, combined with 2p core shielding
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