![]() ![]() Naturally occurring isotopes are marked in green light green = naturally occurring radionuclides. Mass Number number of protons number of neutrons number of electrons. Isotones and IsobarsThe following table shows the atomic nuclei that are isotonic (same neutron number N = 34) and isobaric (same nucleon number A = 58) with Chromium-58. ![]() The number of neutrons can be found by subtracting the atomic number from the mass number. The atomic number is 24 and that is how many of the protons there are. Since chromium has an atomic number of 24, each atom of it contains 24 protons. Name of the isotope: Chromium-58 Cr-58 Symbol: 58Cr Mass number A: 58 Atomic number Z: 24 (= number of protons) Neutrons N: 34 Isotopic mass: 57.9441845(16) u ( atomic weight of Chromium-58) Nuclide mass: 57.9310189 u (calculated nuclear mass without electrons) Mass excess: -51.9918 MeV Mass defect: 0.538223412 u (per nucleus) Nuclear binding energy: 501.35187894 MeV (per nucleus) 8.64399791 MeV (average binding energy per nucleon) Separation energy: S N = 7.5384(18) MeV (first neutron) S P = 14.87(80) MeV (first proton) Half-life: 7.0(3) s Decay constant λ: 0.099021025794278 s -1 Spin and parity: 0+ Year of discovery: 1980 The number of protons doesn't differ between isotopes and it is number 24. Since chromium has an atomic number of 24, each atom of it contains 24 protons. ![]()
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