In nuclear reactors, promethium equilibrium exists in power operation. How many protons, electrons, and neutrons are in an atom of zinc-65? All of its isotopes are radioactive. Nuclides that have the same neutron number but a different proton number are called isotones. 65 = 30+ N 65 = 30 + N Arsenic is a metalloid.Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C.Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.
The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese.Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Pure germanium is a semiconductor with an appearance similar to elemental silicon.Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. 30 30 protons Fill in the known values where N N represents the number of neutrons. Mass numbers of typical isotopes of Zinc are 64; 66-68; 70. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys.Technetium is the lightest element whose isotopes are all radioactive; none are stable. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil.Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226.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. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Since zinc zinc 's atomic number is 30 30, Zn Zn has 30 30 protons. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation.Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning.Potassium was first isolated from potash, the ashes of plants, from which its name derives. Lead is widely used as a gamma shield. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements.Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge.

These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.Discoverer: Coster, Dirk and De Hevesy, George CharlesDiscoverer: Noddack, Walter and Berg, Otto Carl and Tacke, IdaThe actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Its boiling point is the lowest among all the elements.It is a soft, silvery-white alkali metal. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Zinc - Mass Number - Neutron Number - Zn. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles.Lawrencium is the final member of the actinide series. Tungsten is an intrinsically brittle and hard material, making it difficult to work.Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table.Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). 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.Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities.Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights.1) You may use almost everything for non-commercial and educational use.2) You may not distribute or commercially exploit the content, especially on another website.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 TeodorDiscoverer: Davy, Sir H. and Thénard, L.-J. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars.Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Tellurium is chemically related to selenium and sulfur. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
Europium is one of the least abundant elements in the universe. It is one of the least reactive chemical elements and is solid under standard conditions. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive.Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air.

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