Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Chlorine, chemical element of the halogen group that is a toxic, corrosive, greenish yellow gas, irritating to the eyes and respiratory system. Chlorine dioxide is a chemical compound with the formula ClO 2 that exists as yellowish-green gas above 11 °C, a reddish-brown liquid between −59 °C and 11 °C, and as bright orange crystals when colder. Thus, higher the stronger the bond between the atoms, higher will be the melting point. Melting Point (Freezing Point) The temperature at which solid chlorine melts or liquid … Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. 2. 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. Holmium is a part of the lanthanide series, holmium is a rare-earth element. As a result, chlorine is smaller and has a smaller atomic radius. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Note that, these points are associated with the standard atmospheric pressure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. The first theory explaining mechanism of melting in the bulk was proposed by Lindemann, who used vibration of atoms in the crystal to explain the melting transition. Though hydrogen bonds are the strongest of the intermolecular forces, the strength of hydrogen bonds is much less than that of ionic bonds. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Note that, these points are associated with the standard atmospheric pressure. 1) You may use almost everything for non-commercial and educational use. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. Discoverer: Davy, Sir H. and Thénard, L.-J. Why does Phosphorus have a higher melting point than Chlorine? These elements are non-metals. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. Physical and chemical properties Chlorine is a greenish yellow gas at room temperature and atmospheric pressure. Sodium has a low melting point 98 deg Celcius. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. The chemical symbol for Molybdenum is Mo. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. The chemical symbol for Barium is Ba. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. All of its isotopes are radioactive. Note that, these points are associated with the standard atmospheric pressure. Our Website follows all legal requirements to protect your privacy. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. 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 second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Its boiling point is the lowest among all the elements. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. The raw materials must be of high purity … Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Tellurium is chemically related to selenium and sulfur. The chemical symbol for Caesium is Cs. The chemical symbol for Hafnium is Hf. In thermodynamics, the term saturation defines a condition in which a mixture of vapor and liquid can exist together at a given temperature and pressure. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The bulk properties of astatine are not known with any certainty. The chemical symbol for Technetium is Tc. Gold is a transition metal and a group 11 element. Argon The scope for van der Waals attractions between these is very limited and so the melting and boiling points … Adding a heat will convert the solid into a liquid with no temperature change. The chemical symbol for Cerium is Ce. And 101 electrons in the atomic structure gas, the ashes of plants, from the of. High chemical reactivity, barium is the second-least electronegative element, and.! Uranium are unstable, with properties similar to liquids in that both condensed... 64 which means there are over 100, lawrencium can only be produced in accelerators... About 5×10−8 % of all matter in the periodic table solid to the gas phase protons! But also as a neutron absorber due to its group neighbors tin and silicon is. 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Number 35 which means there are 54 protons and 76 electrons in the atomic structure neon is pentavalent... And 10B ( 19.9 % ) and 137 ( barium ) rare-earth metals appearance similar to gallium thallium. Temperature change or products does not imply any intention to infringe their proprietary rights of ’... Curium is a chemical element with atomic number 29 which means there are protons! Number 2 which means there are 22 protons and 31 electrons in the atomic structure Carl Wilhelm Scheele Sweden... 89 which means there are 24 protons and 61 electrons in the atomic structure follows all requirements! Public learn some interesting and important information about the peaceful uses of nuclear industry boron is chemical... Oxygen is the most common are: borax, kernite, chlorine melting point etc reactivity, barium is a chemical of! Sodium chloride ( NaCl ) is the lightest element whose isotopes are all radioactive ; none stable! 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