美 英 n.相对原子质量 复数:relative atomic masses 权威英汉双解 英英 relative-atomic-mass n. 1. 相对原子质量the average mass of all the naturally occurring atoms of a chemical element 例句
(Chemistry) the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12. Symbol:MrAbbreviation:r.m.m.Former name:molecular weight ...
An atomic mass unit is defined as 1/12th the mass of a carbon-12 atom. Since the mass of electrons is much smaller than that of protons and neutrons, the atomic mass is nearly identical to the mass number. Atomic mass is denoted with the symbol ma. Relative Isotopic Mass - This is...
Atomic mass (Information management12 Abstract: To minimize confusion in the expression of measurements of isotope and 13 gas ratios, a glossary based on recommendation by the Commission on Isotopic 14 Abundances and Atomic Weights of the IUPAC is presented. Entries in the 15 glossary are ...
•Recordandlearnthedefinitionofrelativeatomicmassfoundonp8ofyourtextbook.Youshouldalsorecordandlearnthedefinitionforrelativeisotopicmass.•Ensureyouareclearwhythesearenotthesameandwilltypicallyproducedifferingvalues.AverageMass?5kg 15kg AverageMass?15kg15kg 5kg 15kg CalculatingRelativeAtomicMasses •Amachine...
Keywordschemicalelement化学元素relativeatomicmass相对原子质量atomicweight原子量invariant不变量radioactiveelement放射性元素isotope同位素half-time半衰期uncertainty未确定值source来源IUPAC（InternationalUnionofPureandAppliedChemistry）国际纯粹与应用化学委员会缩写词 CommissiononAtomicWeightsandIsotopicAbundances原子量与同位素丰度...
isotopicelementrelativetoCarbon-12.•Example:chlorineoccursinisotopeformsCl-35(75.5%)andCl-37(24.5%)•Relativeatomicmass=•((75.5x35)+(24.5x37))/(75.5+24.5)=35.5•Trythis:neon-20(90.9%),neon-21(0.3%),andneon-22(8.8%)30/03/2017CalculatingpercentagemassCalculatingpercentagemassIfyoucan...
The total cross sections for the reactions H + D/sub 2/ = HD + D and H + HD = H/sub 2/ + D have been measured as a function of relative initial translational energy in the ranges 0.87 to 2.70 and 0.82 to 1.86 eV, respectively. The technical for measuring the rate constant exploi...
32. Roscoe R, Buurman P, Velhorst E (2001) Soil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in Cerrado's Oxisol. Geoderma 104: 185–202. doi:10.1016/S0016-7061(01)00080- 5. 33. Arsene M-A, Bilba K,...