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Chemistry | Definition, Topics, Types, History, Facts | Britannica Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization Today, vinyl, Teflon, liquid crystals, semiconductors, and superconductors represent the fruits of chemical technology
Chemical compound | Definition, Examples, Types | Britannica Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds
Chemical element | Definition, Origins, Distribution, Facts | Britannica A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes Elements are the fundamental materials of which all matter is composed Learn more about the origins, distribution, and characteristics of chemical elements in this article
Chemical formula | Definition, Types, Examples, Facts | Britannica chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds The forms commonly encountered are empirical, molecular, structural, and projection formulas
chemical reaction - Students | Britannica Kids | Homework Help Chemical reactions abound in the natural world, changing the composition of matter within Earth, on its surface, and in the atmosphere, and driving a vast array of processes in living systems Chemical reactions in the digestive system help break down food into glucose and other constituent molecules that can be absorbed by cells
chemical element - Students | Britannica Kids | Homework Help Any substance that cannot be decomposed into simpler substances by ordinary chemical processes is defined as a chemical element Only 94 such substances are known to exist in nature (and two of them occur in only trace amounts)
list of chemical elements - Encyclopedia Britannica periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number —i e , the total number of protons in the atomic nucleus
Periodic table | Definition, Elements, Groups, Charges, Trends, Facts . . . Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in the same column (group) have similar properties