Another observation of the oganesson took place in 2006, but was not considered credible by the IUPAC. The first atoms of oganesson were observed in 2002 by a team headed by Yuri Oganessian. The element known today to have the highest atomic number is the element oganesson, with an atomic number of 118. Number is 2 for helium, 3 for lithium, and so forth. The lowest atomic number is that of hydrogen, which equals 1. What are the lowest and highest atomic numbers? This analogy can be observed in following periods of the periodic table of elements. The second period contains two elements from groups 1 and 2, and then from groups 13, 14, 15, 16, 17 and 18. When we analyse the position of each element in the table, we can see that the first period includes hydrogen and helium, whose atomic numbers are 1 and 2, respectively. Elements are arranged by ascending atomic number, from left to right, in periods. The value of a chemical element’s atomic number is strongly correlated with its position in the periodic table. The atoms of each isotope are called nuclides.Ītomic number and the position of a chemical element in the periodic table ![]() This is due to the fact that the atomic nuclei of the same element contain different numbers of neutrons. A clear difference between isotopes is their atomic mass. Thus the variants have the same nuclear charge (an identical number of protons) and the same number of electrons revolving around it. Isotopes, defined as variants of a specific chemical element, differ in their atomic mass. It is worth keeping in mind that isotopes vary in the value of mass number (the number of nucleons, that is to say, the total of neutrons and protons), while their atomic number is constant. This implies, for instance, an erroneous definition of other issues concerning chemical elements, as in the case of isotopes. Although both concepts have clear definitions, they are often confused. The concepts of atomic number and mass number of chemical elements are often problematic.
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