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Table of nuclides. 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 ...
Pnictogen. The pnictogens[1] (/ ˈpnɪktədʒən / or / ˈnɪktədʒən /; from Ancient Greek: πνῑ́γω "to choke" and -gen, "generator") are the chemical elements in group 15 of the periodic table. This group is also known as the nitrogen group or nitrogen family. Group 15 consists of the elements nitrogen (N), phosphorus (P), arsenic (As ...
It belongs to group 14 of the periodic table. [16] Carbon makes up about 0.025 percent of Earth's crust. [17] Three isotopes occur naturally, 12 C and 13 C being stable, while 14 C is a radionuclide, decaying with a half-life of 5,700 years. [18] Carbon is one of the few elements known since antiquity. [19]
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q.1 h, q.1° quaque 1 hora: every 1 hour (can replace 1 with other numbers) q4PM at 4:00 pm (can replace 4 with other numbers) mistaken to mean every 4 hours q.a.d. quaque alternis die: every other day q.a.m. quaque die ante meridiem: every morning (every day before noon) q.d./q.1.d. quaque die: every day
The solar system abundances table shows that lead, despite its relatively high atomic number, is more prevalent than most other elements with atomic numbers greater than 40. [ 99 ] Primordial lead—which comprises the isotopes lead-204, lead-206, lead-207, and lead-208—was mostly created as a result of repetitive neutron capture processes ...
Almost 25% of women will have had an abortion by age 45, with 20% of 30 year olds having had one. [24] In 2019, 60% of women who had abortions were already mothers, and 50% already had two or more children. [25] [26] Increased access to birth control has been statistically linked to reductions in the abortion rate. [27] [28] [29]
These account for about 30% of gamma-ray bursts, but until 2005, no afterglow had been successfully detected from any short event and little was known about their origins. [67] Since then, several dozen short gamma-ray burst afterglows have been detected and localized, several of which are associated with regions of little or no star formation ...
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