Covalent Bond Theories 1VB2MO3杂化轨道理论 VB1)要点:价键的形成看成是原子轨道 的重叠或电子配对的结果。两个原子的 未成对电子,若自旋相反,就能配对。 HIH LIYING 2021/2/10
LIYING 2021/2/10 Covalent Bond Theories 1.VB 2.MO 3.杂化轨道理论 VB 1) 要点：价键的形成看成是原子轨道 的重叠或电子配对的结果。两个原子的 未成对电子，若自旋相反，就能配对。 H H
A SIMPLE COVALENT BOND A pair of electrons is shared betwen the two bonded atoms H H LIYING 2021/2/10
LIYING 2021/2/10 A SIMPLE COVALENT BOND A pair of electrons is shared between the two bonded atoms. H . .H
A SIMPLE COVALENT BOND Bonded pair H一H LIYING 2021/2/10
LIYING 2021/2/10 A SIMPLE COVALENT BOND H H Bonded pair
Valence of common atoms Valence the number of bonds an atom forms in its neutral ground-state. H H-O-HH一N一HH一B-HH一C一H H H H Oxygen: two Nitrogen three Boron three Carbon: four LIYING 2021/2/10
LIYING 2021/2/10
Common Bonding Patterns Group B TRIVALENT MON ENT Incomplete +3 lo as Octet DIVALENT 2 lone pairs MONOVALENT TRIVALENT Duet +1 lone pair TETRAVALENT LIYING 2021/2/10
LIYING 2021/2/10 Common Bonding Patterns Group III IV V VI VII _______________________________________________________________ .. .. .. .. .. : .. .. .. : TRIVALENT Incomplete Octet TETRAVALENT TRIVALENT DIVALENT MONOVALENT + 1 lone pair + 2 lone pairs + 3 lone pairs MONOVALENT Duet B C N O F C N O C N C H