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Acid: a sharp or sour-tasting substance.The degree of acidity is measured by its pH. Anything with a pH below 7.0 is an acid

Alkali: the opposite of an acid. A substance having a pH higher than 7.0. Alkalis are often compounds containing hydroxide or carbonate, together with an alkaline metal.

Antimatter: matter composed of particles with the opposite charge to normal matter.

Atom: the smallest part of an element that can exist. An atom consists of a core with other tiny particles revol read more...

Tags: spectrum, science, proton, radioactivity

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