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所在平台: Udemy |
课程主页: https://www.udemy.com/course/chemical-bonding-and-molecular-structure/
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课程名称：化学键与分子结构 课程概述：在一个分子中，不同的原子通过一种称为化学键的吸引力相互结合。当两个原子靠近时，一个原子的电子会受到另一个原子电子和原子核运动的影响，这种相互作用可能会在两个原子之间产生吸引力。原子结合主要有两种方式以完成它们各自的八电子稳定构型： 1. 完全转移电子形成的化学键称为电价键或离子键。 2. 通过共享电子形成的化学键。 - 共享电子均由两个结合原子共同贡献的称为共价键。 - 仅由一个原子贡献共享电子的称为配位键或二元键。 此外，路易斯符号或电子点符号是一种简写符号，其中元素的符号代表原子核及内层电子。最外层电子通过点在元素符号旁边表示，对于离子，还会显示离子电荷。分子的路易斯结构是通过结合原子或离子的路易斯符号，根据化学键的形成模式来绘制的。 课程大纲：无
Chemical bond: In a molecule, different atoms are held together by a force of attraction called chemical bond.When two atoms come closer, the electrons of one atom come under the influence of the electrons and the nucleus of the other atom. The interaction might produce an attraction between the two atoms.Types of Chemical Bonds. Atoms combine in order to complete their respective octets mainly in two ways:(i)By complete transfer of electrons. The chemical bond so formed is known as electrovalent bond or ionic bond.(ii) By sharing of electrons. There are two types of such bonds:(a)covalent bond - shared electrons are contributed equally by both the combining atoms.(b) coordinate or dative bond - shared electrons are contributed only by one of the atoms.Lewis symbols or electron dot symbols. According to this shorthand notation, the symbol of an element stands for the nucleus as well as the electrons in the inner energy shells. Each of the electrons in the outermost shell is represented by a dot near the symbol of the element. In case of ions, the ionic charge is also shown along with the symbol. The Lewis Structures of molecules are made by a combination of Lewis symbols of atoms or ions in accordance with the mode of formation of bonds.
