When reversed, it becomes 28. In some ways, it is amazing that any nuclei are stable—with the exception of hydrogen’s main isotope, all nuclei contain protons (which should be repelling each other) in a very small space. In Roman Numerals, 82 is written as LXXXII. Thankfully, it no longer is. So, let's try out the quiz. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. It is the sixth magic number … All the best! Facts about 82. Lead Atomic Number: 82 Lead Atomic Weight: 207.2 What is Lead? I assume that you are referring to nuclear instability. Looking for definition of atomic number 82? Before a name and symbol are approved, an element may be referred to by its atomic number (e.g., element 120) or by its systematic element name. If you're interested in the different chemical properties of Barium 138 and Barium 134, I suggest the "Isotopes of Barium" page on www.wikipedia.org as a good jumping off point. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. In mathematics, 82 is an even number because it is divisible by two. Number of neutrons = mass number – atomic number = 207 – 82 = 125. The chemical symbol for Lead is Pb.. Atomic Mass of Lead. An atom is a primary piece of matter which is made up of protons, neutrons, and electron called subatomic particles. This quiz has been developed to test your knowledge about atomic numbers, protons, atomic mass and neutrons. It is also divisible by 1, 41, and 82. Define atomic number 82 by Webster's Dictionary, WordNet Lexical Database, Dictionary of Computing, Legal Dictionary, Medical Dictionary, Dream Dictionary. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. The systematic element name is a temporary name that is based on the atomic number as a root and the -ium ending as a suffix. For example, element 120 has the temporary name unbinilium. The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. atomic number 82 explanation. The number of protons will always tell you what element it is; the only difference here is their atomic weight (the sum of their protons and neutrons). Its expression in words is eighty-two. Atomic mass of Lead is 207.2 u. Its symbol is Pb, after the Latin plumbum. Atomic number, mass number, and isotopes How to use the atomic number and the mass number to represent different isotopes The following video shows an example of calculating the number of neutrons. Atomic Number: 82 Atomic Mass: 207.2 amu Melting Point: 327.5 °C (600.65 K, 621.5 °F) Boiling Point: 1740.0 °C (2013.15 K, 3164.0 °F) Number of Protons/Electrons: 82 Number of Neutrons: 125 Classification: Other Metals Crystal Structure: Cubic Density @ 293 K: 11.34 g/cm 3 Color: bluish Atomic … As we know, in the past, all the plumbing was made of lead, which results in poisoning and death. Atomic Number of Lead. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). Lead is a chemical element in the carbon group under number 82. 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