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Arsenic in material form, imbedded deep within the earth.

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Arsenic in material form, imbedded deep within the earth.

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33 protons; a mass of 74.922 (.93)

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Knowledge Archive

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3 hydrogen atoms combined with 1 arsenic atom forms Arsine. In gas form it is non-irritating and toxic.

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Discovered: 1250
33 Protons, 33 Electrons, 42 Neutrons.