Chemistry / Unit 5 Chem 0886 short lesson, about 20 seconds
First Ionization Energy Trend
Captions available
The idea
First ionization energy rises across a period as Zeff increases, and falls down a group as the removed electron sits farther out.
In practice
Removing an electron from a small, high-Zeff atom on a period's right takes more energy than from a larger, low-Zeff atom.
Where people slip
A few systematic dips interrupt the across-period rise, tied to subshell arrangements, without overturning the Zeff-driven trend.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Unlocks
- 0889Successive Ionization Energies and the Core-Electron Jump
- 0900Capstone: Predicting a Periodic Trend from Electron Configuration and Zeff
- 2284Metallic Character Tracks Ionization Energy
- 2305Metalloids as Intermediate Semiconductors
- 2311Nonmetal Bonding Type from Electronegativity Difference
- 2355Noble Gas Unreactivity and the Xenon Exception
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