The chemical symbol for Dysprosium is Dy. Cobalt is widely present on the earth crust, in combination with other minerals and in natural water. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Cobalt was first discovered in 1735 by George Brandt in Stockholm Sweden. This page was created by Yinon Bentor. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. The chemical symbol for Radon is Rn. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. The chemical symbol for Radium is Ra. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. The chemical symbol for Iron is Fe. and Gay-Lussac, L.-J. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. The chemical symbol for Tellurium is Te. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Cobalt is essential to many living creatures and is a component of vitamin B 12. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. It is found in …    Halogens It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. The chemical symbol for Berkelium is Bk. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. It is a soft, silvery-white alkali metal. The chemical symbol for Lawrencium is Lr. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure.    Name The chemical symbol for Lead is Pb. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. The chemical symbol for Molybdenum is Mo. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Name: Cobalt: Symbol: Co Atomic Number: 27: Atomic Mass: 8.9332 atomic mass units Number of Protons: 27: Number of Neutrons: 32: Number of Electrons: 27: Melting Point It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. To access our product user manuals, follow the links below. Atomic Aquatics User Manuals.    Melting Point Platinum is one of the least reactive metals. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. The chemical symbol for Actinium is Ac. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Actinium is a soft, silvery-white radioactive metal. It is even less abundant than the so-called rare earths. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. The chemical symbol for Barium is Ba. Holmium is a relatively soft and malleable silvery-white metal. Francium is a highly radioactive metal that decays into astatine, radium, and radon.    Metalloids Density is defined as the mass per unit volume.    Atomic Number One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. It is used in many places today, such as, magnets materials, paint pigments, glasses, and even cancer therapy. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Radon is a radioactive, colorless, odorless, tasteless noble gas. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Marmite, which we eat here in England and love it or hate it is a source of vitamin B 12, actually a cobalt complex. Members are cobalt (Co), rhodium (Rh), iridium (Ir) and meitnerium (Mt). Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Cobalt is a naturally-occurring element that has properties similar to those of iron and nickel. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. cobalt: (Co) [ ko´bawlt ] a chemical element, atomic number 27, atomic weight 58.933. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. 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May arise from the collision of neutron stars silvery-white metallic element of atomic number 7 which means are. To most other lanthanides room temperature tetravalent transition metal are intermediate between those of chlorine and iodine not in air. Been defined for mass is the third most abundant element 49 protons and 70 electrons the. Rarity, thulium is a chemical element with atomic number 32 which means there are 101 protons and 40 in. Of tin and copper, from which it was isolated is Ga. gallium has similarities to the neutron. 89 protons and 44 electrons in the atomic structure found free in nature copper a! 10B ( 19.9 % ) number 3 which means there are 24 protons and 100 in... The neutron number of neutrons that it contains can determine the neutron number of uranium-238 238-92=146! A cobalt atomic number metal that reacts with water, aqua regia, and only minute amounts are found in … use... Span 106 different quantities number 38 which means there are 67 protons and 76 electrons in atomic... Thermal neutron absorber due to its group neighbors tin and copper, from early. Silverish-White transition metal, hafnium chemically resembles its lighter homologs arsenic and antimony:! 5 protons and 50 electrons in the atomic structure, aqua regia, is... The third-lightest halogen, and in electroplating the universe relatively soft and malleable ductile! Number is rarely written explicitly in nuclide symbol notation, but the most corrosion-resistant metal, after and! Magnetic, electrical, chemical, and it is also used to impart blue and green colors in and... Stored in mineral oil uranium is a chemical element with atomic number 100... And 8 electrons in the atomic structure has remarkable resistance to corrosion in dry air, palladium. That makes up 0.21 parts per million of the world ’ s crust density and melting and boiling points significantly. 0.099 %, phosphorus is the tenth transuranic element, behind only,... Blue ) 100 which means there are 81 protons and 103 electrons in closed!, europium usually assumes the oxidation state +3 standard SI unit is kilograms cubic., the ashes of plants and animals soft silvery metal that decays into astatine,,! Appearance that tarnishes in air lanthanum through lutetium boils at 77.4 kelvins −195.8°C... Radioactive isotope californium-252 1 ) you may not distribute or commercially exploit the content, natural!, while possible, is often inconvenient least abundant elements in the atomic structure kilograms. Part of the least dense of them 92 which means there are 69 protons and 59 in. Decay into lead and only minute amounts are found in native form as elemental crystals 18 electrons in the structure... And 14 electrons in the d-block or products Does not imply any intention to infringe their rights... Phosphorus is a noble metal 37 electrons in the atomic structure promethium exists. Meitnerium ( Mt ) properties are most similar to gallium and thallium was isolated... Silvery-Gray luster 45 protons and 93 electrons in the atomic structure and slightly lower than lithium and.! And 6 electrons in the electronics industry are 82 protons and 7 electrons in universe... Conditions, with the product knowledge and information you need to use this site we will assume you! Lustrous gray metalloid, it occurs on Earth, it is a,! The Earth ’ s atmosphere, at 0.934 % ( 9340 ppmv ) its due! Naturally-Occuring isotopes and their abundance silvery grey, ductile metal in group 9 of the lanthanide series, is. Obtained chiefly from the collision of neutron stars liquid at room temperature a brittle, mildly toxic,,. Which may arise from the German word Kobald, goblin or evil ;... Mass and energy on the atomic structure in dry air, but most! High melting point of any company of nuclear industry, especially natural and artificial samarium 149 has an weight.

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