CHEM 110 Chapter Notes - Chapter 7: Spin Quantum Number, Effective Nuclear Charge, Regional Four Day Competition

• School: McGill University
• Department: Chemistry
• Course: CHEM 110
• Professor: Laura Pavelka

Document Summary

Many-electrons atoms: electron configuration: distribution of electrons within the shells & subshells of its atom. Shielding by electrons in inner shells: core e- spend nearly all time: between outer electrons and nucleus cause much lower zeff. Inner transition series: those in which f orbitals (l=3) are being filled: period 6 (lanthanides) 4f filled, period 7 (actinides) 5f orbital filled, above n=5, difference in energy between d and f is blurred. Irregular filling patterns occur in the d and f blocks bc energies differ very little. Increases across a period since electron is harder to remove. Trends in electron affinity: electron affinity: (ea) energy change (kj/mol) accompanies the addition of 1 mol of electrons to 1 mol of gaseous atoms/ions. Trends in electronegativity: electronegativity: () ability of an atom in a bond to attract electron density toward itself, property of an atom in a molecule or an ion, atoms with high electron affinity tend to have high electronegativity.