mention the chemical name arsenic ditection
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Answer:
Explanation:
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid.
Answer:
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.
Arsenic, 33As
Arsen 1a.jpg
Arsenic
Pronunciation
/ˈɑːrsənɪk/
(AR-sən-ik)
as an adjective: /ɑːrˈsɛnɪk/
(ar-SEN-ik)
Allotropes
grey (most common), yellow, black
Appearance
metallic grey
Standard atomic weight Ar, std(As)
74.921595(6)[1]
Arsenic in the periodic table
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury (element)
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Nihonium
Flerovium
Moscovium
Livermorium
Tennessine
Oganesson
P
↑
As
↓
Sb
germanium ← arsenic → selenium
Atomic number (Z)
33
Group
group 15 (pnictogens)
Period
period 4
Block
p-block
Electron configuration
[Ar] 3d10 4s2 4p3
Electrons per shell
2, 8, 18, 5
Physical properties
Phase at STP
solid
Sublimation point
887 K (615 °C, 1137 °F)
Density (near r.t.)
5.727 g/cm3
when liquid (at m.p.)
5.22 g/cm3
Triple point
1090 K, 3628 kPa[2]
Critical point
1673 K, ? MPa
Heat of fusion
grey: 24.44 kJ/mol
Heat of vaporization
34.76 kJ/mol (?)
Molar heat capacity
24.64 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 553 596 646 706 781 874
Atomic properties
Oxidation states
−3, −2, −1, 0,[3] +1,[4] +2, +3, +4, +5 (a mildly acidic oxide)
Electronegativity
Pauling scale: 2.18
Ionization energies
1st: 947.0 kJ/mol
2nd: 1798 kJ/mol
3rd: 2735 kJ/mol
(more)
Atomic radius
empirical: 119 pm
Covalent radius
119±4 pm
Van der Waals radius
185 pm
Color lines in a spectral range
Spectral lines of arsenic
Other properties
Natural occurrence
primordial
Crystal structure
rhombohedralRhombohedral crystal structure for arsenic
Thermal expansion
5.6 µm/(m⋅K)[5] (at r.t.)
Thermal conductivity
50.2 W/(m⋅K)
Electrical resistivity
333 nΩ⋅m (at 20 °C)
Magnetic ordering
diamagnetic[6]
Molar magnetic susceptibility
−5.5×10−6 cm3/mol[7]
Young's modulus
8 GPa
Bulk modulus
22 GPa
Mohs hardness
3.5
Brinell hardness
1440 MPa
CAS Number
7440-38-2
History
Discovery
Arabic alchemists (before AD 815)
Main isotopes of arsenic
Isotope Abundance Half-life (t1/2) Decay mode Product
73As syn 80.3 d ε 73Ge
γ –
74As syn 17.8 d ε 74Ge
β+ 74Ge
γ –
β− 74Se
75As 100% stable
Category Category: Arsenic
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The primary use of arsenic is in alloys of lead (for example, in car batteries and ammunition). Arsenic is a common n-type dopant in semiconductor electronic devices. It is also a component of the III-V compound semiconductor gallium arsenide. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining with the increasing recognition of the toxicity of arsenic and its compounds.[8]
A few species of bacteria are able to use arsenic compounds as respiratory metabolites. Trace quantities of arsenic are an essential dietary element in rats, hamsters, goats, chickens, and presumably other species. A role in human metabolism is not known.[9][10][11] However, arsenic poisoning occurs in multicellular life if quantities are larger than needed. Arsenic contamination of groundwater is a problem that affects millions of people across the world.
The United States' Environmental Protection Agency states that all forms of arsenic are a serious risk to human health.[12] The United States' Agency for Toxic Substances and Disease Registry ranked arsenic as number 1 in its 2001 Priority List of Hazardous Substances at Superfund sites.[13] Arsenic is classified as a Group-A carcinogen.[12]