SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A solid composed of atoms, ions or molecules arranged in a pattern that is periodic in three dimensions.
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Crystal
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Unit cell
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Alloy
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None of the above
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Explanation:
Detailed explanation-1: -A crystal is: a solid composed of atoms, ions, or molecules arranged in a pattern that is repetitive in three-dimensions. Each crystal structure within a specific crystal system is defined by a unit cell.
Detailed explanation-2: -A crystal is a solid where the atoms form a periodic arrangement. (Quasicrystals are an exception, see below). Not all solids are crystals.
Detailed explanation-3: -A crystal lattice is a regular arrangement of the constituent atoms or ions or molecules in three−dimensional space. A crystal lattice also called a space lattice or simply, a lattice.
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