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Find the radius (r) and approximate density \((\rho)\) of a Fe-56 nucleus. Assume the mass of the Fe-56 nucleus is approximately 56 u. Strategy. Finding the radius of \(^{56}Fe\) is a straightforward application of \(r = r_0A^{1/3}\), given \(A = 56\). To find the approximate density of this nucleus, assume the nucleus is spherical.
1 wrz 2024 · Access detailed info on all elements: atomic mass, electron configurations, charges, and more. View rotating Bohr models for all 118 elements. Get a free HD image of the Periodic Table.
Helium-3 is a stable isotope of the chemical element helium. The atomic nucleus of the nuclide consists of the element-specific 2 protons and a neutron, which results in the mass number 3. He-3 is - besides hydrogen-1 - the only stable isotope of an element with more protons than neutrons.
10 sty 2021 · In the case of helium, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms.
The number of protons in the nucleus is called the atomic number (Z) and is the property that defines an atom’s elemental identity. The sum of the numbers of protons and neutrons in the nucleus is called the mass number and, expressed in amu, is approximately equal to the mass of the atom.
Helium-4 makes up about one quarter of the ordinary matter in the universe by mass, with almost all of the rest being hydrogen. While nuclear fusion in stars also produces helium-4, most of the helium-4 in the Sun and in the universe is thought to have been produced during the Big Bang, known as " primordial helium".
In a nuclear decay reaction, also called radioactive decay, an unstable nucleus emits radiation and is transformed into the nucleus of one or more other elements. The resulting daughter nuclei have a lower mass and are lower in energy (more stable) than the parent nucleus that decayed.
