![]() ![]() The different isotopes of a given element have the same atomic number but different mass numbers since they have different numbers of neutrons. This is useful in calculating the cross section for nuclear scattering. If the density ρ of the material is known, then the number of nuclei per unit volume n can be calculated from n =ρN A/A. The mass of an element that is numerically equal to the atomic mass A in grams is called a mole and will contain Avogadro's number N A of nuclei. Carbon 14 is radioactive and thebasis for carbon dating. Carbon-12 is thecommon isotope,with carbon-13as another stableisotope which makes up about1%. The element is determined bythe atomic number 6. ![]() You can easily see the elements groupings according to the ten groups and three big groups in their periodic table placement.Standard nuclear notation shows the chemical symbol, the mass number and the atomic number of the isotope.Įxample: the isotopes of carbon. Nonmetals (nonmetals, halogens, and noble gases):
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