Control of Everything

Electronic Structure and Periodic Properties Electron Configuration Orbital Size Effective Nuclear Charge

Shells, Subshells, Orbitals

Organization of the Periodic Table

Effective Nuclear Charger Z* = Zeff = Z – S Shielding: electrons with greater n = 0 electrons with same n = 0.35 (except d and f, =1) electrons with n one lower, = 0.85 (except d and f, =1) electrons with n two or more lower = 1 P = 1s2 2s2 2p6 3s2 3p3 shielding = 2x1 8 x 0.85 4x0.35 = 5.1 Z* = 15 – 10.2 = 4.8

Trends in Z*: Do Li through Ne: Do C, Si, Ge:

In which region of the periodic table are electrons held most tightly In which region of the periodic table are electrons held most tightly? Least tightly?

Predict trends in atomic size.

Predict trends in ionization energy.

Predict trends in electron affinity.

Predict trends in ionization electronegativity.

Periodic Properties Overall Trend: Electrons held most tightly in upper left of periodic table