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For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbon, but atoms of carbon may have mass numbers of 12 or 13.The standard presentation of the chemical elements is in the periodic table, which orders elements by atomic number.An alchemist was called a 'chemist' in popular speech, and later the suffix "-ry" was added to this to describe the art of the chemist as "chemistry".The modern word alchemy in turn is derived from the Arabic word al-kīmīā (الكیمیاء).The word chemistry comes from alchemy, which referred to an earlier set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism and medicine.It is often seen as linked to the quest to turn lead or another common starting material into gold, though in ancient times, the study encompassed many of the questions of modern chemistry being defined as the study of the composition of waters, movement, growth, embodying, disembodying, drawing the spirits from bodies and bonding the spirits within bodies by the early 4th century Greek-Egyptian alchemist Zosimos.However glassware is not central to chemistry, and a great deal of experimental (as well as applied/industrial) chemistry is done without it.The basis of such a chemical transformation is the rearrangement of electrons in the chemical bonds between atoms.

substances, metals, crystals and other aggregates of matter.A molecule is the smallest indivisible portion of a pure chemical substance that has its unique set of chemical properties, that is, its potential to undergo a certain set of chemical reactions with other substances.However, this definition only works well for substances that are composed of molecules, which is not true of many substances (see below).Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds.There are four types of chemical bonds: covalent bonds, in which compounds share one or more electron(s); ionic bonds, in which a compound donates one or more electrons to another compound to produce ions (cations and anions); hydrogen bonds; and Van der Waals force bonds.

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