![]() Molecules include hydrogen (H 2), oxygen (O 2), nitrogen (N 2), chlorine (Cl 2) etc. Atoms include sodium (Na), calcium (Ca), silver (Ag), gold (Au), helium (He), neon (Ne). The constituent particles of elements can be atoms or molecules. Some of the examples are elements are sodium, calcium, silver, gold, sulphur, phosphorus, helium, neon, hydrogen, oxygen, nitrogen &c. Pure substances in which constituent particles are composed of the one type of atoms are called elements. The water is represented by these molecules, which are identical and show the same chemical properties.īased on the nature of constituent particles, we can subcategorise pure substances into elements and compounds. Similarly, the constituent particles of pure water are its molecules (H2O). ![]() Each atom in the gold bar is identical to other atoms and they all have the same chemical properties. Constituent particles in the gold bar are its atoms. But they are produced by industries, for example, refining of dore bar (semi-pure gold) by the Wohlwill process, extraction of calcium carbonate from a quarry, electrolysis of sodium chloride to produce hydrogen gas.Ĭonsider a gold bar. Pure substances are normally not found in nature. Examples of pure substances (clockwise from top left: copper dendrites, gold biscuits, calcium carbonate powder, a glass of pure water, and liquid nitrogen.)
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