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Bookmark or Share- Periodic table | Definition, Elements, Groups, Charges, Trends, & Facts ...The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
- Chemical compound | Definition, Examples, & Types | BritannicaChemical 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 formula | Definition, Types, Examples, & Facts | Britannicachemical 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.
- Chemistry | Definition, Topics, Types, History, & Facts | BritannicaMost of the materials that occur on Earth, such as wood, coal, minerals, or air, are mixtures of many different and distinct chemical substances. Each pure chemical substance (e.g., oxygen, iron, or water) has a characteristic set of properties that gives it its
- chemical element - Kids | Britannica Kids | Homework HelpA chemical element is a basic substance. It cannot be broken down into simpler substances. Chemical elements are the building blocks for all matter—that is, everything that takes up space in the universe. They are sometimes just called elements. There are 92 chemical elements found in nature. Scientists have created more than 20 additional ...
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