Inorganic Chemistry ACS Study Guide
(2026/2027) | Updated Bank | 100%
Verified Answers | A+
• Ionization energy increases -✓✓left to right across a row and up
column of the periodic table
• Electron affinity increases -✓✓left to right across a row and up a
column of the periodic table
• Element size increases -✓✓right to left across and row and down a
column of the periodic table
• Ionization energy -✓✓the energy required to remove an electron from
an atom
• Electron affinity -✓✓the energy required to add an electron to an atom
• In M.O. theory, the number of atomic orbitals must equal... -✓✓the
number of molecular orbitals
• M.O. requirements -✓✓1. M.O.s must be built from symmetrically
appropriate orbitals
2. Energy in bond pairs needs to be approximately the same
3. Efficient overlap of orbitals in a bond
, • Anti bonding orbitals -✓✓higher in energy than bonding orbitals,
created by overlap of orbitals that are out of phase with each other,
contain nodes
• Node -✓✓a region with no electron density
• Bond order -✓✓b=0.5(# bonding electrons - # anti-bonding electrons)
tells you how many bonds to expect in a molecule
• M.O.s for B2, C2, and N2 -✓✓there is a small change in energy
between 2s and 2p orbitals, causing them to mix
this results in the 3 sigma orbital to be higher in energy than the 1 pi
orbital
• Heteronuclear M.O. theory -✓✓the more electronegative atom is
lower in energy
• Non-bonding orbitals -✓✓essentially lone pairs, caused when the
overlap between orbitals is not enough
• CO M.O. diagram -✓✓reaction takes place at carbon because the
frontier orbital is mainly "carbon-like" in character
the 3 sigma orbital switches places with the 1 pi orbital
(2026/2027) | Updated Bank | 100%
Verified Answers | A+
• Ionization energy increases -✓✓left to right across a row and up
column of the periodic table
• Electron affinity increases -✓✓left to right across a row and up a
column of the periodic table
• Element size increases -✓✓right to left across and row and down a
column of the periodic table
• Ionization energy -✓✓the energy required to remove an electron from
an atom
• Electron affinity -✓✓the energy required to add an electron to an atom
• In M.O. theory, the number of atomic orbitals must equal... -✓✓the
number of molecular orbitals
• M.O. requirements -✓✓1. M.O.s must be built from symmetrically
appropriate orbitals
2. Energy in bond pairs needs to be approximately the same
3. Efficient overlap of orbitals in a bond
, • Anti bonding orbitals -✓✓higher in energy than bonding orbitals,
created by overlap of orbitals that are out of phase with each other,
contain nodes
• Node -✓✓a region with no electron density
• Bond order -✓✓b=0.5(# bonding electrons - # anti-bonding electrons)
tells you how many bonds to expect in a molecule
• M.O.s for B2, C2, and N2 -✓✓there is a small change in energy
between 2s and 2p orbitals, causing them to mix
this results in the 3 sigma orbital to be higher in energy than the 1 pi
orbital
• Heteronuclear M.O. theory -✓✓the more electronegative atom is
lower in energy
• Non-bonding orbitals -✓✓essentially lone pairs, caused when the
overlap between orbitals is not enough
• CO M.O. diagram -✓✓reaction takes place at carbon because the
frontier orbital is mainly "carbon-like" in character
the 3 sigma orbital switches places with the 1 pi orbital
