The difference between Arsenic and Arsenious
When used as adjectives, arsenic means of or containing arsenic with a valence of 5, whereas arsenious means of or containing arsenic with a valence of 3.
Arsenic is also noun with the meaning: a nonmetallic chemical element (symbol as) with an atomic number of 33.
check bellow for the other definitions of Arsenic and Arsenious
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Arsenic as a noun:
A nonmetallic chemical element (symbol As) with an atomic number of 33.
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Arsenic as a noun (countable):
A single atom of this element.
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Arsenic as a noun:
Arsenic trioxide.
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Arsenic as an adjective:
Of or containing arsenic with a valence of 5.
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Arsenious as an adjective (chemistry):
Of or containing arsenic with a valence of 3.