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Lead

Oct 28, 1000

Lead is a chemical element in the carbon group with symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals.Lead has a shiny chrome-silver luster when it is melted into a liquid

Arsenic

Oct 28, 1250

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.

Zinc

Oct 28, 1500

Zinc, in commerce also spelter, is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because its ion is of similar size and its only common oxidation state is +2.

Antimony

Oct 28, 1600

Antimony is a toxic chemical element with symbol Sb and atomic number 51.Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead. It was established to be an element around the 17th century

Phosphorous

Oct 28, 1669

Phosphorus is a chemical element with symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus as a mineral is almost always present in its maximally oxidised state, as inorganic phosphate rocks. Elemental phosphorus exists in two major forms—white phosphorus and red phosphorus—but due to its high reactivity, phosphorus is never found as a free element on Earth.

Platinum

Oct 28, 1700

Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived from the Spanish term platina, which is literally translated into "little silver". It is a dense, malleable, ductile, precious, gray-white transition metal.

Nickel

Oct 28, 1751

Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile. Pure nickel shows a significant chemical activity that can be observed when nickel is powdered to maximize the exposed surface area on which reactions can occur, but larger pieces of the metal are slow to react with air at ambient conditions due to the formation of a protective oxide surfac

Nitrogen

Oct 28, 1755

Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere. The element nitrogen was discovered as a separable component of air, by Scottish physician Daniel Rutherford, in 1772.

Oxygen

Oct 28, 1774

Oxygen is a chemical element with symbol O and atomic number 8. Its name derives from the Greek roots ὀξύς (oxys) ("acid", literally "sharp", referring to the sour taste of acids) and -γόνος (-gοnos) ("producer", literally "begetter"), because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition.

Chlorine

Oct 28, 1774

Chlorine is a chemical element with symbol Cl and atomic number 17. Chlorine is in the halogen group (17) and is the second lightest halogen after fluorine. The element is a yellow-green gas under standard conditions, where it forms diatomic molecules.

Aluminium

Oct 28, 1825

Aluminium (or aluminum) is a chemical element in the boron group with symbol Al and atomic number 13. It is silvery white, and it is not soluble in water under normal circumstances. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface.

Fluorine

Oct 28, 1886

Fluorine (symbol F) is the chemical element with atomic number 9. It is the lightest halogen. At standard pressure and temperature, fluorine is a pale yellow gas composed of diatomic molecules, F2.

Argon

Oct 28, 1894

Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 (noble gases) of the periodic table.

Helium

Oct 28, 1895

Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions.

Krypton

Oct 28, 1898

Krypton is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquified air, and is often used with other rare gases in fluorescent lamps.

Neon

Oct 28, 1898

Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 (noble gases) of the periodic table. Neon is a colorless, odorless monatomic gas under standard conditions, with about two-thirds the density of air.

Polonium

Oct 28, 1898

Polonium is a chemical element with the symbol Po and atomic number 84, discovered in 1898 by Marie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores.

Radium

Oct 28, 1898

Radium is a chemical element with symbol Ra and atomic number 88. Radium is an almost pure-white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in color.

Actinium

Oct 28, 1899

Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and has the atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated.

Radon

Oct 28, 1900

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as an indirect decay product of uranium or thorium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.

Francium

Oct 28, 1939

Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is one of the two least electronegative elements, the other being caesium.

Plutonium

Oct 28, 1940

Plutonium is a transuranic radioactive chemical element with the symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, forming a dull coating when oxidized.

Americium

Oct 28, 1944

Americium is a transuranic radioactive chemical element that has the symbol Am and atomic number 95. This transuranic element of the actinide series is located in the periodic table below the lanthanide element europium, and thus by analogy was named after another continent, America.

Dubnium

Oct 28, 1970

Dubnium is a chemical element with the symbol Db and atomic number 105, named after the town of Dubna in Russia, where it was first produced.

Unumbium

Oct 28, 1996

Copernicium is a chemical element with symbol Cn and atomic number 112. It is an extremely radioactive synthetic element that can only be created in a laboratory.

Sulfur

Oct 27, 2000

Sulfur is a chemical element with symbol S and atomic number 16. It is an abundant, multivalent non-metal. It oxidizes most metals and several nonmetals, including carbon, which leads to its negative charge in most organosulfur compounds, but it reduces several strong oxidants, such as oxygen and fluorine.

Tin

Oct 28, 2100

Tin is a chemical element with symbol Sn and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows chemical similarity to both neighboring group 14 elements, germanium and lead and has two possible oxidation states, +2 and the slightly more stable +4.

Iron

Oct 28, 2500

Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core.

Silver

Oct 27, 3000

Silver is a metallic chemical element with the chemical symbol Ag and atomic number 47. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.

Gold

Oct 28, 3000

Gold is a dense, soft, shiny, malleable and ductile metal. It is a chemical element with the symbol Au and atomic number 79. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements solid under standard conditions.

Copper

Oct 27, 5000

Copper is a chemical element with the symbol Cu and atomic number 29. It is used as a conductor of heat and electricity, a building material, and a constituent of various metal alloys.

Carbon

Oct 27, 5730

Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Carbon is one of the few elements known since antiquity.