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Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 4th EditionCh.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory문제 32
10장, 문제 32

A molecule with the formula AB3 has a trigonal planar geometry. How many electron groups are on the central atom?

검증된 단계별 안내
1
Identify the molecular geometry given in the problem, which is trigonal planar.
Recall that a trigonal planar geometry is associated with a central atom surrounded by three atoms in a plane, forming 120-degree bond angles.
Understand that the geometry is determined by the number of electron groups around the central atom, which include both bonding pairs and lone pairs of electrons.
Recognize that in a trigonal planar geometry, there are no lone pairs on the central atom, only bonding pairs.
Conclude that the number of electron groups on the central atom is equal to the number of atoms bonded to it, which is 3 in this case.

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주요 개념

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Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. In the case of AB3, where A is the central atom and B represents the surrounding atoms, the trigonal planar geometry indicates that the three B atoms are arranged around A in a flat, triangular shape, with bond angles of approximately 120 degrees.
추천 영상:
가이드 코스
01:33
Molecular Geometry with Two Electron Groups

Electron Groups

Electron groups include all regions of electron density around a central atom, which can be lone pairs, single bonds, double bonds, or triple bonds. In the context of the AB3 molecule, the central atom A has three bonding pairs of electrons associated with the three B atoms, leading to a total of three electron groups.
추천 영상:
가이드 코스
00:51
Electron Groups Example

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) theory is a model used to predict the geometry of molecules based on the repulsion between electron pairs. According to VSEPR, electron groups will arrange themselves to minimize repulsion, which helps determine the molecular shape, such as the trigonal planar configuration observed in AB3.
추천 영상:
가이드 코스
02:13
Molecular Shapes and VSEPR
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