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This is sometimes dominated by alpha decay or spontaneous fission, especially for the heavy elements. Observed decay modes are listed as α for alpha decay, SF for spontaneous fission, and n for neutron emission in the special case of 5 He. For mass 5 there are no bound isobars at all; mass 8 has bound isobars, but the beta-stable 8 Be is ...
Naturally occurring silver (47 Ag) is composed of the two stable isotopes 107 Ag and 109 Ag in almost equal proportions, with 107 Ag being slightly more abundant (51.839% natural abundance). Notably, silver is the only element with all stable istopes having nuclear spins of 1/2.
Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for T c and P c is indicated by the number of digits.
A point particle is an appropriate representation of any object whenever its size, shape, and structure are irrelevant in a given context. For example, from far enough away, any finite-size object will look and behave as a point-like object. Point masses and point charges, discussed below, are two common cases.
7 [8] Tetranitrocubane explosive - computed [citation needed] 6.95: Ammonal (Al+NH 4 NO 3 oxidizer) [citation needed] 6.9: 12.7: Tetranitromethane + hydrazine bipropellant - computed [citation needed] 6.6: Nitroglycerin: 6.38 [9] 10.2 [10] ANFO-ANNM [citation needed] 6.26: battery, Lithium–air: 6.12: Octogen (HMX) 5.7 [9] 10.8 [11] TNT [12] 4 ...
8 sodium-33: 8 magnesium-37: 8 livermorium-290: 8.3 oxygen-13: 8.58 lithium-11: 8.59 fluorine-26: 9.6 bohrium-262m: 9.6 thorium-207: 9.7 bismuth-186m: 9.8 boron-15: 9.87 darmstadtium-270m: 10 radium-219: 10 hassium-277: 11 nitrogen-12: 11 astatine-192: 11.5 bohrium-261: 11.8 roentgenium-274: 12 boron-14: 12.5 bismuth-204m1: 13.0 livermorium-292 ...
has units of mass, and it is the only parameter in the Standard Model that is not dimensionless. It is also much smaller than the Planck scale and about twice the Higgs mass, setting the scale for the mass of all other particles in the Standard Model. This is the only real fine-tuning to a small nonzero value in the Standard Model.
In theory, no two stable nuclides have the same mass number (since no two nuclides that have the same mass number are both stable to beta decay and double beta decay), and no stable nuclides exist for mass numbers 5, 8, 143–155, 160–162, and ≥ 165, since in theory, the beta-decay stable nuclides for these mass numbers can undergo alpha decay.