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Above Z = 20, stable nuclides have more neutrons than protons (N/Z > 1.0). At higher Zs, the stability of nuclei tends toward neutron-rich nuclides. It has been observed that nuclei with 2, 8, 20, 28, 50, 82, or 126 nucleons (protons and neutrons combined) are stable. Most stable nuclides have both even Z and even N called "even-even" nuclides. We can understand this in terms of Pauli's exclusion principle.

The nuclide of thorium that contains 1.5 times as many neutrons as protons. Z = A = N = View Chapter 4 - Radioactivity.docx from NURSING NUR 101 at Notre Dame University, Cotabato City. CHAPTER 4: RADIOACTIVITY I. Nuclide and Isotopes A Z A: mass number (neutrons + protons) Z: atomic Nuclide Protons Neutrons Z А 66 97 Х 5 ? 52 I 4G 24 10 21. This problem has been solved! See the answer.

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Radioactivity •Unstable combinations of N For example: iron-56 has 30 neutrons and 26 protons, an n:p ratio of 1.15, whereas the stable nuclide lead-207 has 125 neutrons and 82 protons, an n:p ratio equal to 1.52. This is because larger nuclei have more proton-proton repulsions, and require larger numbers of neutrons to provide compensating strong forces to overcome these electrostatic repulsions and hold the nucleus together. Atomic Number (Z) The atomic number is the number of protons in the nucleus of an atom.

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> 0 since the Coulomb force is weakening the nucl convenient to imagine building nuclides up from hydrogen atoms, 1H, rather than bare protons.

Calcium-43 is composed of 20 protons, 23 neutrons, and 20 electrons. Nuclides are specific types of atoms or nuclei. Every nuclide has a chemical element symbol (E) as well as an atomic number (Z) , the number of protons in the nucleus, and a mass number (A), the total number of protons and neutrons in the nucleus.
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The number of neutrons in a nucleus is known as the neutron number and is given the symbol N. The total number of nucleons, that is, protons and neutrons in a nucleus, is equal to Z + N = A, where A is called the mass number. The various species of atoms whose nuclei contain particular numbers of protons and neutrons are called nuclides.
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nuclide, w hile the B et h e -Joh n so n E O S co mp oses a neutron now consists mainly of neutrons along with minute amounts of electrons and protons. ho u g h t o f a s c o mp a ct i fi e d , a cc or d in g t o 9 a lu za - 9lein. Liu, Z. A.. Inst High Energy Phys, Beijing 100049, Peoples R China.