Question

Write down three questions that are answered by the text. (No Yes/No answers) text: Boron atoms, whose nuclei consist of 5 protons and 6 neutrons, have an atomic mass of 11.01 u. However, the atomic mass of boron in the Periodic table is given as 10.8 u. If the atomic mass of Boron atoms is determined using modern analysis methods, two values are obtained, 10.01 u and 11.01 u. From this it can be concluded that there exist two different varieties of boron atoms that differ in their atomic mass. Accordingly, the element boron is an element consisting of 80% boron atoms with the mass of 11.01 u and 20% boron atoms with the mass of 10.01 u. The percentage composition of the different boron atoms cannot be changed, so that the average atomic mass is, 10.81 u. Both boron nuclei contain the same number of protons, but they differ in the number of neutrons. So there are the boron atom nuclei &�#$ with 5 neutrons and &�## with 6 neutrons. Atoms of the same element, which differ in their number of nucleons and thus in their atomic mass, but which have the same atomic number, are called isotopic atoms or isotopes for short. Isotopic atoms of an element show the same chemical properties, since this is only determined by the number of electron and therefore also by the number of protons, but not by the neutron number. The same symbols are therefore used for isotopes. The majority of the chemical elements consist of a mixture of isotopes. The elements are called polyisotopic elements. In contrast, there are 20 monoisotopic elements, each consisting only of the same isotopic atoms. The structure of some selected polyisotopic

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