ch 3 sept 27
ch 3 sept 27 CHM 151
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This 5 page Class Notes was uploaded by Stefanie Bennett on Tuesday September 27, 2016. The Class Notes belongs to CHM 151 at Maricopa Community Colleges - Glendale Community College taught by Dr. Tina Palmer in Fall 2016. Since its upload, it has received 4 views. For similar materials see Intro to Chemistry in Chemistry at Maricopa Community Colleges - Glendale Community College.
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Date Created: 09/27/16
September 27, 2016 Tuesday, September3:53 PM16 Isoelectronic series: Atoms or ions in an isoelectronic series will have the same number of electrons (same electron configuration) but NOT the same number of protons. Chapter 3 Page 1 Chapter 3 Page 2 Effective nuclear charge (Z eff Electrons are attracted to the positive charge of the nucleus anrepelled by any adjacent electrons. The effective nuclear charge is the actual charge the electron experiences taking into account the attraction to the positive nucleus and any shielding experienced by electron-electron repulsions. • Since hydrogen has one electron and one proton the effective nuclear charge and the actual nuclear charge are the same. • For all other atoms, the inner core electrons are very effective at shielding and the outer electrons don’t experience the full nuclear charge. Z = Z - shielding eff Chapter 3 Page 3 Ionization energy (IE) is the minimum amount of energy required to remove an electron from an atom in the gaseous phase. First ionization energy is the energy required to remove the outer most electron. 1s 2s 2p 3s6 1 IE1= 496 kJ/mol for Na Second ionization energy is the amount of energy required to remove the next outer most electron in the reverse aufbau order. 2 2 6 1s 2s 2p IE 2 4562 kJ/mol for Na Chapter 3 Page 4 Chapter 3 Page 5
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