Dear students, you are already familiar with the structure of Periodic table. You should be convinced that the properties of substances formed by the elements in the studied groups change in a regular pattern. However, you are stilt looking for the answers of many questions, right? Why and how are the atoms of chemical elements bound? What is the relationship between structure and properties of substances of practical importance? You are also interested in finding out whether the studied substances are useful or harmful. Which are essential for life and which pollute the air we breathe, our water and food? How to recognize them, how to use them rationally and how to protect ourselves? Seek the answers of these questions, spoken in the language of inorganic chemistry, in this part of your textbook.
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