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Chemistry is the science concerned with compounds composed of atoms (elements), and molecules, which are combinations of atoms whose composition, structure, properties, behavior changes during a reaction with other compounds. Chemistry considers how atoms and molecules interact via chemical bonds to form new chemical compounds. There are four types of chemical bonds: covalent bonds, where compounds share one or more electron(s); ionic bonds, where a compound donates one or more electrons to another compound to produce ions (cations and anions); hydrogen bonds; and Van der Waals force bonds.
Leopold Classic Library has the goal of making available to readers the classic books that have been out of print for decades. While these books may have occasional imperfections, we consider that only hand checking of every page ensures readable content without poor picture quality, blurred or missing text etc. That's why we:
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