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Some airlines omit the row number 13, reputedly because of a widespread superstition that the number is unlucky. This is the case with Lufthansa, for example (as shown on the Lufthansa A321/100 seating plan). Emirates used to have a row 13, but on their latest A380 aircraft have removed it (as shown on Emirates A380-800 seating plan).
The A380-800 layout with 519 seats displayed (16 First, 92 Business and 411 Economy) The Airbus A380 features two full-length decks, each measuring 49.9 metres (164 ft). The upper deck has a slightly shorter usable length of 44.93 metres (147.4 ft) due to the front fuselage curvature and the staircase.
A table or chart of nuclides is a two-dimensional graph of isotopes of the elements, in which one axis represents the number of neutrons (symbol N) and the other represents the number of protons (atomic number, symbol Z) in the atomic nucleus. Each point plotted on the graph thus represents a nuclide of a known or hypothetical chemical element.
Interactive Chart of Nuclides (Brookhaven National Laboratory) The Lund/LBNL Nuclear Data Search; An isotope table with clickable information on every isotope and its decay routes is available at chemlab.pc.maricopa.edu; An example of free Universal Nuclide Chart with decay information for over 3000 nuclides is available at Nucleonica.net.
However, it is possible that some isotopes that are now considered stable will be revealed to decay with extremely long half-lives (as with 209 Bi). This list depicts what is agreed upon by the consensus of the scientific community as of 2023. [1] For each of the 80 stable elements, the number of the stable isotopes is given.
Isotopes are never separated in the periodic table; they are always grouped together under a single element. When atomic mass is shown, it is usually the weighted average of naturally occurring isotopes; but if no isotopes occur naturally in significant quantities, the mass of the most stable isotope usually appears, often in parentheses. [8]
The 2025 Golden Globes are going down tonight, and the seating chart just dropped—revealing some pretty compelling details. For starters, Selena Gomez (who's nominated for both Only Murders in ...
The term isotopes (originally also isotopic elements, [4] now sometimes isotopic nuclides [5]) is intended to imply comparison (like synonyms or isomers). For example, the nuclides 12 6 C, 13 6 C, 14 6 C are isotopes (nuclides with the same atomic number but different mass numbers [6]), but 40 18 Ar, 40 19 K, 40 20 Ca are isobars (nuclides with ...