Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Particle locations in quantum mechanics are not at an exact position, they are described by a probability density function. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Francium is Fr. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. In the periodic table, potassium is one of the alkali metals. Titanium can be used in surface condensers. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Although neodymium is classed as a rare earth, it is a fairly common element. The chemical symbol for Scandium is Sc. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Carbon is one of the few elements known since antiquity. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. The chemical symbol for Lead is Pb. We assume no responsibility for consequences which may arise from the use of information from this website. The chemical symbol for Lithium is Li. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. The chemical symbol for Technetium is Tc. If there are too many or too few neutrons for a given number of protons, the resulting nucleus is not stable and it undergoes radioactive decay. Unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, gamma decay or electron capture. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Pure radium is silvery-white alkaline earth metal. The chemical symbol for Thorium is Th. Its boiling point is the lowest among all the elements. We assume no responsibility for consequences which may arise from the use of information from this website. Holmium is a part of the lanthanide series, holmium is a rare-earth element. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Technetium is the lightest element whose isotopes are all radioactive; none are stable. It occurs on Earth as the decay product of various heavier elements. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group 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. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is a noble metal and a member of the platinum group. 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. It can be observed from the chart that there are more neutrons than protons in nuclides with Z greater than about 20 (Calcium). Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. The chemical symbol for Helium is He. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Bromine, Br, 35: There are 35 protons, 35 electrons and 45 neutrons in a neutral atom of Bromine. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. The bulk properties of astatine are not known with any certainty. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). 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. The chemical symbol for Promethium is Pm. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. The chemical symbol for Molybdenum is Mo. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 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. The chemical symbol for Iron is Fe. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The chemical symbol for Manganese is Mn. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. The chemical symbol for Actinium is Ac. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. The chemical symbol for Rhenium is Re. The chemical symbol for Scandium is Sc. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. It occurs on Earth as the decay product of various heavier elements. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. 113Cd has specific absorption cross-section. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Tin is the element which has maximum number of stable isotopes which is 10. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. But this “huge” space is occupied primarily by electrons, because the nucleus occupies only about 1721×10−45 m3 of space. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical symbol for Platinum is Pt. The name samarium is after the mineral samarskite from which it was isolated. The chemical symbol for Hafnium is Hf. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). It is one of the least reactive chemical elements and is solid under standard conditions. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The chemical symbol for Europium is Eu. The chemical symbol for Xenon is Xe. 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. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Properties of atomic nuclei (atomic mass, nuclear cross-sections) are determined by the number of protons and number of neutrons (neutron number).

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