Properties & Reactions of Arsenic
Arsenic
in the Periodic Table
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Some properties of arsenic are summarized in the table below.
Atomic Number:
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33 | Atomic Radius:
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0.125 nm | |||
Atomic Symbol:
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As | Melting Point:
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~817 ºC | |||
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Atomic Weight:
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74.9216 | Boiling Point:
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603 ºC (sublimation) | |||
Electronic
Configuration: |
[Ar] 4s23d104p3 | Oxidation States:
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5,3,2,-1 |
Arsenic falls below phosphorus in the Table of Elements, and the two elements share many similar properties (see table below). However, in spite of the similarities, there exist some critical differences. Arsenic is toxic to both animals and plants, while phosphorus is a beneficial nutrient for all animals and plants.
Comparison of Arsenic and Phosphorus
Property
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Arsenic
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Phosphorus
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| Atomic Radius, nm | 0.125 (as +3)
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0.093 (as +5)
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| Predominant Oxidation States | +5,+3
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+5
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| H3AsO4 or H3PO4 – pK1 | 2.20
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2.15
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| H3AsO4 or H3PO4 – pK2 | 6.97
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7.20
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| H3AsO4 or H3PO4 – pK3 | 11.53
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12.38
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| Symmetry of AsO4 or PO4 | tetrahedral
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tetrahedral
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Bangladesh Consortium For Arsenic Management Overview | Graduate Fellows Symposia Presentations| Contacts |