Seal of Good Local Governance (SGLG) 2024Final.pptx
Chem powerpoint
1. Section 7.4
Ionization Energy
Dan Corney
Anna Erkalova
Frank Muzika
John Yoffee
2. Overview
• Ionization energy – the minimum energy required to remove
an electron from the ground state of the isolated gaseous
atom or ion.
• Variations in Successive Ionization
Energies
• Periodic Trends in First Ionization
Energies
• Electron Configurations of Ions
• Applications outside of class
3. Ionization Energy Variations
• Increases with each electron
– More energy require to remove an electron from a more positive ion
• Removing inner shell electrons causes GREAT increases in
energy
– Inner shells are much closer to the nucleus
• Large increase always exists when taking from Noble Gas Core
6. First Ionization Energy Trends
• Within Rows, I increases with Atomic Number
• Within Groups, I decreases with Atomic
Number
• Representative Elements show a larger range
of values of I
7. First Ionization Energy Trends
• Smaller Atoms tend to have Higher Energies
– Closer to nucleus
– Minor irregularities due to
• Electron repulsion (Nitrogen to Oxygen)
• Electron Shielding (Beryllium to Boron)
9. Electron Configuration of Ions
• Electrons are always removed from orbitals
with largest principal quantum number.
• This means that 4s would be removed before
3d
11. Questions
• By looking at following electronic
configuration of elements, can you predict
which element has the lowest first ionization
energy?
-(A) 1s2 2s2 2p6 (B) 1s2 2s2 2p4 (C) 1s2 2s2
2p6 3s2 (D) 1s2 2s2 2p6 3s1 (E) 1s2 2s2 2p5
• Low first ionization energy is considered a
property of Metals or Non-Metals?
12. Questions
• Write the Electron Configuration for Co3+.
• Arrange the following atoms in order of
increasing first ionization energy. Ne, Na, P, Ar, K.
• Ionization energy is the ability to capture an
electron.
-True/False
