Notes on the properties of Arsenic: Boiling Point: Arsenic sublimates at this temperature. Specific Heat: Value given for solid alpha form. Vickers Hardness: converted from Brinell scale Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.
Chemical properties of arsenic - Health effects of arsenic - Environmental effects of arsenic
- As is the chemical symbol for the element arsenic. Its atomic number is 33, which is the number of protons in the nuclei of its atoms. In a neutral atom, the number of electrons equals the number of protons, which means that neutral arsenic atoms have 33 electrons.
- Our arsenic page has over 190 facts that span 107 different quantities. Each entry has a full citation identifying its source. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature.
- Arsenic is a grey-appearing chemical element (atomic number 33, symbol As in the periodic table) also termed a metalloid. Arsenic can exist in a metallic state in three forms (yellow, black, and gray; with gray predominating) and in ionic forms.
Arsenic is one of the most toxic elements that can be found. Despite their toxic effect, inorganic arsenic bonds occur on earth naturally in small amounts. Humans may be exposed to arsenic through food, water and air. Exposure may also occur through skin contact with soil or water that contains arsenic.
A lethal dose of arsenic oxide is generally regarded as 100 mg.
Environmental effects of arsenic
The arsenic cycle has broadened as a consequence of human interference and due to this, large amounts of arsenic end up in the environment and in living organisms. Arsenic is mainly emitted by the copper producing industries, but also during lead and zinc production and in agriculture. It cannot be destroyed once it has entered the environment, so that the amounts that we add can spread and cause health effects to humans and animals on many locations on earth.
Plants absorb arsenic fairly easily, so that high-ranking concentrations may be present in food. The concentrations of the dangerous inorganic arsenics that are currently present in surface waters enhance the chances of alteration of genetic materials of fish. This is mainly caused by accumulation of arsenic in the bodies of plant-eating freshwater organisms. Birds eat the fish that already contain eminent amounts of arsenic and will die as a result of arsenic poisoning as the fish is decomposed in their bodies.
More information on properties of arsenic
Read more on arsenic in water
Information on arsenicosis
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The Element Arsenic
[Click for Isotope Data]
Atomic Number: 33
Chemical Properties Of Arsenic
Atomic Weight: 74.921595
Melting Point: 1090 K (817°C or 1503°F)
Boiling Point: 887 K (614°C or 1137°F)
Density: 5.776 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Semi-metal
Period Number: 4
Group Number: 15
Group Name: Pnictogen
What's in a name? From the Latin word arsenicum, the Greek word arsenikon and the Arabic word Az-zernikh.
Say what? Arsenic is pronounced as AR-s'n-ik.
History and Uses:
Although arsenic compounds were mined by the early Chinese, Greek and Egyptian civilizations, it is believed that arsenic itself was first identified by Albertus Magnus, a German alchemist, in 1250. Civilization v - scenario pack: wonders of the ancient world cracker barrel. Arsenic occurs free in nature, but is most often found in the minerals arsenopyrite (FeAsS), realgar (AsS) and orpiment (As2S3). Today, most commercial arsenic is obtained by heating arsenopyrite.
Arsenic and its compounds are poisonous. They have been used to make rat poison and some insecticides. Small amounts of arsenic are added to germanium to make transistors. Gallium arsenide (GaAs) can produce laser light directly from electricity.
6.88 Grams Of Arsenic To Mass Percent
If you were paying careful attention to the physical data listed above, you may have noticed that arsenic's boiling point is lower than its melting point. This occurs because these two temperatures are measured at different atmospheric pressures. When heated at standard atmospheric pressure, arsenic changes directly from a solid to a gas, or sublimates, at a temperature of 887 K. In order to form liquid arsenic, the atmospheric pressure must be increased. At 28 times standard atmospheric pressure, arsenic melts at a temperature of 1090 K. If it were also measured at a pressure of 28 atmospheres, arsenic's boiling point would be higher than its melting point, as you would expect.
Estimated Crustal Abundance: 1.8 milligrams per kilogram
Estimated Oceanic Abundance: 3.7-3 milligrams per liter
Number of Stable Isotopes: 1 (View all isotope data)
Ionization Energy: 9.815 eV
Oxidation States: +5, +3, -3
Electron Shell Configuration:
3s2 3p6 3d10
For questions about this page, please contact Steve Gagnon.