The name derives from the Greek Selene who was the Greek goddess of the Moon because the element is chemically found with tellurium Tellus was the Roman goddess of the Earth. For example 63 Cu 29 protons and 34 neutrons has a mass number of 63 and an isotopic mass in its nuclear ground state is 6291367 u.
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For other isotopes the isotopic mass usually differs and is usually within 01 u of the mass number.
What element has the atomic mass of 27. 9092 abundance with 1999 amu 026 abundance with 2099 amu and 882 abundance with 2199 amu. An element has the following natural abundances and isotopic masses. For 12 C the atomic mass is exactly 12u since the atomic mass unit is defined from it.
Calculate the average atomic mass of this element. Selenium was discovered by the Swedish chemist Jöns Jacob Berzelius in 1817 while trying to isolate tellurium in an impure sample. Relatively low melting points decreasing with atomic mass Vigorous exothermic reaction with water to produce hydrogen gas and an alkali metal hydroxide solution Ionize to lose their electron so the ion has a 1 charge.
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