At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust.Sulfur is abundant, multivalent, and nonmetallic. 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. is the average number of  protons plus neutrons of all the isotopes of  is the number of protons plus neutrons of a specific isotope of  to a whole number.So,by rounding,we are getting mass number  of By the difference between mass number and atomic number of  is 35 here for this isotope.Remember that neutrons are present in the nucleous of  is 30.Remember that number of electron equals to proton in a neutral atom.Eletrons are present outside of nucleus of Nickel belongs to the transition metals and is hard and ductile.Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.Sodium is a soft, silvery-white, highly reactive metal.

Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals.Neodymium is a soft silvery metal that tarnishes in air. It is even less abundant than the so-called rare earths. Its boiling point is the lowest among all the elements.It is a soft, silvery-white alkali metal. Tellurium is far more common in the universe as a whole than on Earth.

The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis.Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. It is one of the least reactive chemical elements and is solid under standard conditions. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen.Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry.Main purpose of this project is to help the public learn some interesting and important information about chemical elements, Our Website follows all legal requirements to protect your privacy.
Neptunium is the first transuranic element.Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized.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.Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide.Berkelium is a member of the actinide and transuranium element series.Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium).

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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