刘易斯点符号与刘易斯结构之间的区别

的key difference在刘易斯点符号和刘易斯结构之间Lewis dot symbol representselectrons在最外面的电子外壳中atomin a molecule whereas Lewis structure represents the structure of molecules using symbols for chemical elements and dot symbols.

Lewis structure is a simple structure which represents the chemical bonds and loneelectron pairsin simple molecules. The Lewis dot symbol represents one electron; thus, we need to use two dots to represent a chemical bond.

CONTENTS

1.Overview and Key Difference
2.What is Lewis Dot Symbol
3.What is Lewis Structure
4.Side by Side Comparison – Lewis Dot Symbol vs Lewis Structure in Tabular Form
5.概括

What is Lewis Dot Symbol?

路易斯点符号代表一个电子。的refore, if we need to show a chemical bond in a molecule, then we need to use two electrons as a pair since a chemical bond forms when two electrons from two different atoms pair with each other. Moreover, we have to use a pair of dots to show a lone electron pair. The dot symbols are placed around the symbol of chemical element to which the particular atom belongs. For example, we can give the electron of the hydrogen atom as follows:

What is Lewis Structure?

Lewis structure is a representation of simple molecules using dot symbols. These dot symbols represent the electrons of the outermost orbital of atoms in the molecule. When drawing a Lewis structure, first we need to find the number of valence electrons of all the atoms in the molecule. Then, we need to find the number of electrons that fill-up the outer electron shell, following the octet rule. After that, we have to determine the number of chemical bonds that are present in the molecule, and we also need to figure out whether they are in single bonds, double bonds and triple bonds.

此外，我们需要根据原子的电负性确定分子的中心原子。在这里，具有最小电负性的原子被视为中央原子。然后，我们可以为该分子绘制骨骼结构。对于此骨骼表示，我们可以使用化学元素和点符号的符号。我们必须在表示一个化学键时使用两个点，并在将电子对放置键的电子对后，其余电子可以表示为孤独电子对。

Let us consider an example in order to understand the methodology of drawing a Lewis structure. The steps for drawing the Lewis structure for the methane molecule is as follows:

• 的chemical formula of methane is CH4.
• 的carbon atom is less electronegative than the hydrogen atom. Therefore, the central atom of the molecule is carbon.
• It has four electrons in the outermost electron shell.
• 的re are four hydrogen atoms around the central carbon atom. Four hydrogen atoms need four electrons from carbon atom to form single chemical bonds. Therefore, all four valence electrons of carbon atoms are involved in bonding, and there are no lone electron pairs around carbon atom in this molecule.

What is the Difference Between Lewis Dot Symbol and Lewis Structure?

刘易斯结构是一种简单的结构，代表简单分子中的化学键和孤独的电子对。刘易斯点符号和刘易斯结构之间的关键区别在于，刘易斯点符号代表一个分子中原子最外部的电子外壳中的电子，而刘易斯结构代表使用化学元素和点符号的符号的分子结构。

Below is a side by side comparison of the difference between Lewis dot symbol and Lewis structure.

摘要 - 刘易斯点符号与刘易斯结构

Lewis structure is a simple structure which represents the chemical bonds and the lone electron pairs in simple molecules. The key difference between Lewis dot symbol and Lewis structure is that the Lewis dot symbol represents electrons in the outermost electron shell of an atom in a molecule. Meanwhile, a Lewis structure represents the structure of molecules using symbols for chemical elements and dot symbols

Reference:

1. Helmenstine, Todd. “How to Draw a Lewis Structure.” ThoughtCo, Sep. 6, 2019,Available here.

Image Courtesy:

1. “Hydrogen lewis” By Ricordisamoa – Own work, vector version of File:Hydrogen lewis.png (Public Domain) viaCommons Wikimedia
2. “Elektronenformel Punkte CH4” By Apostoloff – Own work (Public Domain) viaCommons Wikimedia