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(An atomic mass unit is defined as 1/12th the mass of a \(^{12}C\) nucleus.) In atomic mass units, the mass of a helium nucleus ( A = 4 ) is approximately 4 u. A helium nucleus is also called an alpha ( α ) particle.
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.
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. An atom is neutral when it contains equal numbers of electrons and protons.
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. Note: For future use, bookmark this Periodic table or visit “PeriodicTableGuide.com”
When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu) and the fundamental unit of charge (e). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen.
10 sty 2021 · Often a nuclide is referenced by the name of the element followed by a hyphen and the mass number. For example, C 614 C 6 14 is called “carbon-14.” Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus.
26 kwi 2024 · To find a reasonable approximation of the atomic mass of an atom in atomic mass units, we can simply add the number of protons and neutrons. So the atomic mass formula is: Or. where: N N — Number of neutrons in the atom.
