It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. The chemical symbol for Antimony is Sb.

You can specify conditions of storing and accessing cookies in your browser. 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. Express Your Answer As An Integer. The chemical symbol for Scandium is Sc. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Its abundance is 100%; no other isotopes of fluorine … Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Each nuclide is denoted by chemical symbol of the element (this specifies Z) with tha atomic mass number as supescript. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. The chemical symbol for Calcium is Ca. There are two naturally occuring "Isotopes" of Fluorine. (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. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. The chemical symbol for Astatine is At. Uranium has the highest atomic weight of the primordially occurring elements. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Mass numbers of typical isotopes of Fluorine are 19. Neptunium is the first transuranic element. 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 Francium is Fr. Uranium is a silvery-white metal in the actinide series of the periodic table.

The chemical symbol for Manganese is Mn. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. 1 See answer kujursharon060 is waiting for your help. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. The excess neutrons act somewhat like nuclear glue. Only two stable nuclides have fewer neutrons than protons: hydrogen-1 and helium-3. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. The chemical symbol for Lithium is Li. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. If we include man made elements, the densest so far is Hassium. Hassium is a chemical element with symbol Hs and atomic number 108. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. The chemical symbol for Erbium is Er. In nuclear reactors, promethium equilibrium exists in power operation. Lead is a heavy metal that is denser than most common materials. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. The difference is a measure of the nuclear binding energy which holds the nucleus together. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure.

The chemical symbol for Strontium is Sr. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. The chemical symbol for Technetium is Tc. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Vitamin E and KC. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. 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. ●The atomic mass of fluorine is the average number of protons plus neutrons of all the isotopes of fluorine. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge.

It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. 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. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3.

Francium is a highly radioactive metal that decays into astatine, radium, and radon. Unsaturated fatC. The atomic mass is the mass of an atom. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 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. All of these4. The chemical symbol for Nobelium is No. The chemical symbol for Neon is Ne. 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’. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Europium is Eu.

The chemical symbol for Oxygen is O. Marasmus d. Both a and5. 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. For example, the neutron number of uranium-238 is 238-92=146. Astatine is the rarest naturally occurring element on the Earth’s crust.

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