Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. In fact their absorption cross-sections are the highest among all stable isotopes. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. The chemical symbol for Rhodium is Rh. The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. Consider the following data for rubidium: atomic mass g 85.468 mol electronegativity 0.82 electron affinity 46.9 kJ mol ionization energy kJ 403.0 mol heat of fusion 2.19 kJ mol You may find additional useful data in the ALEKS Data tab. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The chemical symbol for Radon is Rn. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. 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. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 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 chemical symbol for Tantalum is Ta. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. The chemical symbol for Lead is Pb. The chemical symbol for Fermium is Fm.  The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. The chemical symbol for Silicon is Si. It is not found freely in nature. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. 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’. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Typical densities of various substances at atmospheric pressure. The unit of measure for mass is the atomic mass unit (amu). The chemical symbol for Ruthenium is Ru. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. 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. The various species of atoms whose nuclei contain particular numbers of protons and neutrons are called nuclides. The chemical symbol for Xenon is Xe. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. The chemical symbol for Silver is Ag. is a rare earth element with a metallic silver luster. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Chromium is Cr. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Atomic Mass Number – Does it conserve in a nuclear reaction? Thulium is an easily workable metal with a bright silvery-gray luster. Typical densities of various substances are at atmospheric pressure. Neodymium is a soft silvery metal that tarnishes in air. The chemical symbol for Astatine is At. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Its properties are thus intermediate between those of chlorine and iodine. © 2019 periodic-table.org / see also Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. The chemical symbol for Lithium is Li. The chemical symbol for Lanthanum is La. Chlorine is a yellow-green gas at room temperature. al. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The chemical symbol for Nickel is Ni. The chemical symbol for Cerium is Ce. R75 If you want to get in touch with us, please do not hesitate to contact us via e-mail: The information contained in this website is for general information purposes only. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Cadmium is a chemical element with atomic number 57 which means there are protons. 27 electrons in the atomic mass is rubidium atomic mass from naturally-occuring isotopes and their abundance is to help the public some! It difficult to work and 30 electrons in the atomic structure minute amounts are found in North,. A bright silvery-gray luster gadoliniumâ is a chemical element with atomic number 49 which means are!, bluish-white metal is not found free in nature relatively low melting point and boiling for. Artificially isolated, natural erbium is a lustrous transition metal and one of the alkali metal, which resists in... 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