Containing seven water molecules or seven hydrogen atoms bonded to a central atom in a chemical compound.
From Greek 'hepta' (seven) + 'hydro' (water) + '-ic' (adjective suffix). The term emerged in 19th-century chemistry as scientists classified compounds by their water content and hydrogen arrangement.
Chemists use this term for specific mineral salts and compounds—for example, heptahydric calcium sulfate has seven water molecules attached, which affects its properties and how it dissolves in water, making chemistry's naming system like a molecular recipe card.
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