When drawing chemical structures, if we do not know the chemical meaning of some structures, we cannot learn them better. This article will explain the chemical meanings of chemical structural isotopes, free radicals, and H points, and give corresponding examples.

1. ChemDraw The chemical meaning of isotopes and elements

ChemDraw uses the data information provided by CRC Press Company to accurately identify all isotope information on the periodic table. The isotope information for the Macintosh version is defined in the Isotopes Table, and the isotope information for the Windows version is defined in the isotopes.txt file. When you need to modify or add new isotopes, you can edit it with any text editor.

Let’s take a closer look at examples of isotopes, as shown in Figure 1:

1. The isotope is marked as a superscript in the upper left corner of the element symbol;

2. Isotopes can be included in any position that general elements can be in;

3. Tritium and titanium can be represented by their own symbols.

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Figure 1

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2. Chemical significance of ChemDraw free radicals

1. You can select the free radical symbol from the "Chemical Symbols" toolbox,

2. Similar to the charge distribution rule of ChemDraw, if you want to understand the charge distribution principle, please click to visit the charge distribution rule of ChemDraw and the method of drawing the electron transfer direction. Free radicals can be assigned to the atoms closest to them, and free radicals always occupy one Free price, now let's look at examples. As shown in Figure 2

3. The chemical meaning of ChemDraw H dots and H strokes

1.H points and H strokes can be selected from the "Chemical Symbols" toolbox and are used to indicate the stereoscopic direction of a single hydrogen atom.

2. These symbols are most commonly used in fusion systems. The following figure gives examples of H dots and H strokes. As shown in Figure 3

Summary: The above is the chemical meaning of ChemDraw isotopes and elements, ChemDraw free radicals, and H dots/H strokes. The chemical meanings discussed here include the properties, functions, drawing methods, etc. of the basic structure.