2 CHEMISTRY-RELATIVE ATOMIC MASSthe mass of a hydrogen atom 1/1H is equal to 1/12 of the mass of a carbon-12 atomso its relative isotopic mass is 1.A magnesium atom 24/12Mg is twice as heavy as a carbon-12 atom,
混合物 mixture 相对原子质量 relative atomic mass(abbr. Ar) 相对分子质量 relative molecular mass (abbr. Mr) 化学式量 relative formula mass 物质的量 amount of substance 阿伏加德罗常数 Avogadro constant (abbr. NA) 摩尔mole 摩尔质量 molar mass 实验式/最简式/经验式 empirical formula 气体摩尔体积 mol...
We model three different meteoric metals: sodium, magnesium, and calcium. Results suggest that sodium ablates to a greater extent than does calcium and that it ablates at a substantially higher altitude. Deposition at lower altitudes leads to more rapid conversion of the atomic calcium into ...
When considering the universe, the most abundant chemical elements arehydrogen and helium. When considering the earth, the most common element is iron whose mass percentage is 32.1%. Other elements are oxygen (32.1%),silicone(15.1%),magnesium(13.9%),sulfur(2.9%) and other elements are present ...
atomic stopping power 原子阻止本领 linear stopping power 线性阻止本领,阻止本领 effective stopping power 有效阻止本领 stopping power 阻止本领,制动功率,制动能力 molecular stopping power 分子阻止本领 mass stopping power 质量阻止本领 mass collission stopping power 质量碰撞阻止本领 mass radiative stop...
The Mantel test confirmed a substantial correlation between soil chemical constituents, including the availability of nitrogen, phosphorus, potassium, calcium, magnesium, organic matter, and pH, and the microbial community structure. A positive link was found between the potassium and nitrogen contents ...
(Cs), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), dysprosium (Dy), europium (Eu), erbium (Er), iron (Fe), gallium (Ga), gadolinium (Gd), germanium (Ge), mercury (Hg), holmium (Ho), lanthanum (La), lithium (Li), lutetium (Lu), potassium (K), magnesium ...
Domesticated species are impacted in unintended ways during domestication and breeding. Changes in the nature and intensity of selection impart genetic drift, reduce diversity, and increase the frequency of deleterious alleles. Such outcomes constrain ou
Since the refractive index of typical dielectrics are between ~1.38 (magnesium fluoride, MgF2) and ~2.6 (titanium dioxide, TiO2), the required efforts are significantly reduced compared to the case where the refractive indices and thicknesses of all the three D–M–D layers need to be ...
There have been recent efforts to develop dry environmentally friendly techniques to sort low atomic number light weight metals and alloys such as magnesium (atomic number Z=12) and aluminum (Z=13) and their alloys from higher atomic number heavier metals such as iron (Z=26), copper (z=29...