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Hello little scientists, I am Professor Bill Tyson and together were gonna know different forms of science. Weve talked about chemical elements. The time has come to start joining their atoms and building bigger structures. When we join two or more atoms they form a structure called molecule. Molecules are the smallest part of a substance. And the substances are divided into two types: simple and compound. In nature most of the elements are found together, even in pairs, atoms are so needy, you know. For example the oxygen we breathe, in the nature is found in pairs, which means, two atoms of oxygen together. We say then that this is a simple substance, since it is formed by only one type of chemical element. And we also have compound substances like water, which is formed by one atom of oxygen attached to two other hydrogen atoms. So, compound substances are formed by different chemical elements. Forming a substance atoms join together by a process called a covalent bond. Atoms love
