Actinium is a soft, silvery-white radioactive metal. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Hafnium is Hf. 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. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. It occurs on Earth as the decay product of various heavier elements. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Helium is a 2. chemical element in the periodic table of elements. The chemical symbol for Iron is Fe. In nuclear reactors, promethium equilibrium exists in power operation. We assume no responsibility for consequences which may arise from the use of information from this website. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Major advantage of lead shield is in its compactness due to its higher density. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. It's the lightest noble gas. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. The chemical symbol for Copper is Cu. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Helium atoms have 2 electrons and the shell structure is 2. We use cookies to ensure that we give you the best experience on our website. The chemical symbol for Uranium is U. Zirconium is widely used as a cladding for nuclear reactor fuels. Helium is the second element on the periodic table, with atomic number 2 and element symbol He. The chemical symbol for Platinum is Pt. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Terbium is Tb. The chemical symbol for Holmium is Ho. The chemical symbol for Caesium is Cs. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. The chemical symbol for Lanthanum is La. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. It is a colorless, flavorless gas, best known for its use in filling floating balloons. The chemical symbol for Osmium is Os. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The chemical symbol for Indium is In. Detailed decay information for the isotope helium-3 including decay chains and daughter products. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. He called the element helium. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. I would be delighted to receive corrections as well as additional referenced uses.. filling balloons (blimps) as it is a much safer gas than hydrogen; widely used as an inert gas shield for arc welding in countries where helium is cheaper than argon Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. This group contains the noble gases, which are the most chemically inert elements on the periodic table.Each He atom has two protons and usually two neutrons and two electrons. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and … Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The periodic table game available on this page is for entertainment purposes only, and should not be used to grade students on their knowledge of chemical elements. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Its boiling point is the lowest among all the elements. Cerium is the second element in the lanthanide series. Origin of Name: From the Greek word helios, meaning sun: Date and Place of Discovery: 1868 in France and in England 1895 in England: Discovered by: Pierre Janssen in France first noticed a bright yellow line during an eclipse (1868); Norman Lockyer in England noticed a yellow line in the solar spectrum (1868); Sir William Ramsay discovered helium on earth (1895) Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. Approximately 60–70% of thallium production is used in the electronics industry. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Helium was isolated by Sir William Ramsay and independently by N. A. Langley and P. T. Cleve at 1895 in London, England and Uppsala, Sweden. Helium-3 (3 He, tralphium, see also helion) is a light, stable isotope of helium with two protons and one neutron (the most common isotope, helium-4, having two protons and two neutrons in contrast).Other than protium (ordinary hydrogen), helium-3 is the only stable isotope of any element with more protons than neutrons. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. 113Cd has specific absorption cross-section. The chemical symbol for Neodymium is Nd. The chemical symbol for Curium is Cm. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). The chemical symbol for Arsenic is As. Neptunium metal is silvery and tarnishes when exposed to air. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Radon is a radioactive, colorless, odorless, tasteless noble gas. 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