Isoelectronic species same number of total electrons

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Isoelectronic species: same number of TOTAL electrons • What monoatomic ions are isoelectronic What monoatomic ions are isoelectronic with Ne? • What is Z felt by the valence electrons of What is Z eff felt by the valence electrons of each species? A th i f l t t ll t Arrange the ions from largest to smallest based on Z eff considerations 28 S. Ensign, chemical bonding
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Isoelectronic species: same number of electrons What monoatomic ions are isoelectronic with Ne? What is Z eff felt by the valence electrons of each species? Arrange the ions from largest to smallest based on Z eff considerations 29 S. Ensign, chemical bonding
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This week in chemistry No on line quiz this week Recitations meet re ie e am 2 and re ie Recitations meet, review exam 2, and review beginning of chapter 8, recitation quiz Read materials for chapter 8 work problems in chapter 8 self test, watch chapter 8 self test tutorials to help in developing problem-solving skills. S. Ensign, Chem. 1210 30 S. Ensign, Chem. 1210 S. Ensign, chemical bonding
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Isoelectronic species: same number of electrons What monoatomic ions are isoelectronic with Ne? What is Z eff felt by the valence electrons of each species? Arrange the ions from largest to smallest based on Z eff considerations 31 S. Ensign, chemical bonding
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Which of the following sets contains species th t ll i l t i ? that are all isoelectronic? a O F Ne a. O, F, Ne b. C, Si, Ge P 3 S 2 Cl c. 3- , S 2- , Cl - d. Na, Mg, Al 32 S. Ensign, chemical bonding
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Covalent bonding Sharing of valence electrons between atoms Usually nonmetal + nonmetal Share electrons such that each nonmetal has an octet of electrons (ex., H) 33 S. Ensign, chemical bonding
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H 2 bond formation H H H H 34 S. Ensign, chemical bonding
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Potential energy diagram for H-H bond formation 400 mol) 200 ergy (kJ/m 0 Ene -200 0 0 0 5 1 0 1 5 2 0 2 5 3 0 -400 radius (angstroms) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 35 S. Ensign, chemical bonding
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Only the valence electrons are important in covalent bond formation Cl: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 F: 1 s 2 2 s 2 2 p 5 n = 3 n = 2 n = 1 n = 2 17 p+ n = 1 17 p+ F Cl 36 S. Ensign, chemical bonding
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A simple rule (that works a lot of the time) for predicting the number of covalent bonds necessary f f i l to form an octet for an atom in a covalent compound: 8 - group# 37 S. Ensign, chemical bonding
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A simple rule (that works a lot of the time) for predicting the number of covalent bonds necessary f f i l to form an octet for an atom in a covalent compound: 8 - group# 38 S. Ensign, chemical bonding
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