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化学键的类型
Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type…
路易斯符号和八偶体规则
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis…
离子键和电子转移
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its…
玻恩-哈伯循环
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a…
晶格能量的趋势:离子大小和电荷
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a…
共价键和路易斯结构
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual…
电负性
Whether a bond is nonpolar or polar covalent is determined by a property of the bonding atoms called electronegativity.  Electronegativity…
键极性、偶极矩和离子性百分比
The absolute value of the difference in electronegativity (ΔEN) of two bonded atoms provides a rough measure of the polarity to be expected…
分子化合物和多原子离子的路易斯结构
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined: Determine the…
共振
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O…
形式电荷
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used…
八偶体规则的例外情况
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three…
键能和键长
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break…
金属中的键
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the…
强场绝热电离多原子自由基阳离子超快振动相干的测量
We present a pump-probe method for preparing vibrational coherences in polyatomic radical cations and probing their ultrafast dynamics. By shifting…
碳纳米片在室温下准备
Amphiphilic molecules equipped with a reactive, carbon-rich "oligoyne" segment consisting of conjugated carbon-carbon triple bonds self-assemble into…

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