Write the noble-gas notation for the electron configurations of each of the following elements: a. Hf d. At b. Sc e. Ac c. Fe f. Zn 4
Tuesday, September 29, 2015 Chapter 4 (cont.), Chapter 5 4.5 - Electron Configurations of Ions - Write configuration for Na: • 1s 2s 2p 3s 1 - Add or remove the appropriate number of electrons • Na: 1s 2s 2p 3s —> Na+: 1s 2s 2p (10 electrons total, isoelectronic with Ne) 2 2 6 1 5 - 2 2 6 2 6 • Cl: 1s 2s 2p 3s 3p —> Cl :1s 2s 2p 3s 3p (add electron)(18 electrons, isoelectronic with Ar) - ions of main group elements isoelectronic- species with identical electron configurations to the noble gas to the • right (also, same number of electrons) • elements on opposite sides tend to be ionic, vice versa - ions of d-block elements • formed by remov
