bAn atom or a group of atoms which carries positive or negative charge is called an ……………..
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Opaque objects block light from traveling through them. Most of the light is either reflected by the object or absorbed and converted to thermal energy. Materials such as wood, stone, and metals are opaque to visible light.
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Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. ... Positively charged ions are called cations; negatively charged ions, anions.
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