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21 Caret Silver Finger Ring (AD Stone)

21 Caret Silver Finger Ring (AD Stone)

৳1300 ৳1200

21 Caret Silver Finger Ring (AD Stone)

Brand: WellToDoBD 

Silver Caret: 21

Stone Weight: 8

Made in: Bangladesh

Stone Name: AD Stone

Stone Colour:Yellow

Category : Silver Ornaments

Available Size

  • Adjustable
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16

Available Colors

  • Silver
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Silver

From Wikipedia, the free encyclopedia

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This article is about the chemical element. For the use of silver as a medication, see Medical uses of silver. For other uses, see Silver (disambiguation).

Silver, 47Ag
Silver crystal.jpg
Silver
Appearance lustrous white metal
Standard atomic weight Ar, std(Ag) 107.8682(2)[1]
Silver 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
Cu

Ag

Au
palladium ← silver → cadmium
Atomic number (Z) 47
Group group 11
Period period 5
Block   d-block
Electron configuration [Kr] 4d10 5s1
Electrons per shell 2, 8, 18, 18, 1
Physical properties
Phase at STP solid
Melting point 1234.93 K ​(961.78 °C, ​1763.2 °F)
Boiling point 2435 K ​(2162 °C, ​3924 °F)
Density (near r.t.) 10.49 g/cm3
when liquid (at m.p.) 9.320 g/cm3
Heat of fusion 11.28 kJ/mol
Heat of vaporisation 254 kJ/mol
Molar heat capacity 25.350 J/(mol·K)
Vapour pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1283 1413 1575 1782 2055 2433
Atomic properties
Oxidation states −2, −1, +1, +2, +3 (an amphoteric oxide)
Electronegativity Pauling scale: 1.93
Ionisation energies
  • 1st: 731.0 kJ/mol
  • 2nd: 2070 kJ/mol
  • 3rd: 3361 kJ/mol
  •  
Atomic radius empirical: 144 pm
Covalent radius 145±5 pm
Van der Waals radius 172 pm

Color lines in a spectral range

Spectral lines of silver
Other properties
Natural occurrence primordial
Crystal structure face-centred cubic (fcc)

Face-centered cubic crystal structure for silver

Speed of sound thin rod 2680 m/s (at r.t.)
Thermal expansion 18.9 µm/(m⋅K) (at 25 °C)
Thermal conductivity 429 W/(m⋅K)
Thermal diffusivity 174 mm2/s (at 300 K)
Electrical resistivity 15.87 nΩ⋅m (at 20 °C)
Magnetic ordering diamagnetic[2]
Molar magnetic susceptibility −19.5×10−6 cm3/mol (296 K)[3]
Young's modulus 83 GPa
Shear modulus 30 GPa
Bulk modulus 100 GPa
Poisson ratio 0.37
Mohs hardness 2.5
Vickers hardness 251 MPa
Brinell hardness 206–250 MPa
CAS Number 7440-22-4
History
Discovery before 5000 BC
Main isotopes of silver
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
105Ag syn 41.2 d ε 105Pd
γ
106mAg syn 8.28 d ε 106Pd
γ
107Ag 51.839% stable
108mAg syn 418 y ε 108Pd
IT 108Ag
γ
109Ag 48.161% stable
110mAg syn 249.95 d β− 110Cd
γ
111Ag syn 7.45 d β− 111Cd
γ
Category Category: Silver  | references

Silver is a chemical element with the symbol Ag (from the Latin argentum, derived from the Proto-Indo-European h₂erǵ: "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivitythermal conductivity, and reflectivity of any metal.[citation needed] The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.

Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold:[4] while it is more abundant than gold, it is much less abundant as a native metal.[5] Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures.

Other than in currency and as an investment medium (coins and bullion), silver is used in solar panelswater filtrationjewellery, ornaments, high-value tableware and utensils (hence the term "silverware"), in electrical contacts and conductors, in specialized mirrors, window coatings, in catalysis of chemical reactions, as a colorant in stained glass and in specialised confectionery. Its compounds are used in photographic and X-ray film. Dilute solutions of silver nitrate and other silver compounds are used as disinfectants and microbiocides (oligodynamic effect), added to bandages and wound-dressings, catheters, and other medical instruments.

 

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