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DOWNLOAD HSEB NOTES ON ATOMIC NUCLEI | CHEMISTRY
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Amazingly enough, human mind that is kind of contained inside a couple of liters of human's brain, is able to deal with extremely large as well as extremely small objects such as the whole universe and its smallest building blocks. So, what are these building blocks? As we already know, the universe consists of galaxies, which consist of stars with planets moving around. The planets are made of molecules, which are bound groups (chemical compounds) of atoms. There are more than 1020 stars in the universe. Currently, scientists know over 12 million chemical compounds i.e. 12 million diferent molecules. All this variety of molecules is made of only a hundred of diferent atoms. For those who believe in beauty and harmony of nature, this number is still too large. They would expect to have just few diferent things from which all other substances are made. In this chapter, we are going to find out what these elementary things are.
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Chemistry