Limits of Visibility of Fluorescence and the Maximum Value of the Absolute Weight of the Atom of HydrogenSpring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1905), 201-11; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder...
the average weight of a molecule of an element or compound measured in units based on 1/12 the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule.Abbr.:mol. wt. [1875–80] Random House Kernerman Webster's College Dictionary, © 2010 K Dicti...
Atomic weight definition: the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon-12 atom. Abbr
Atoms of the same element that differ in theiratomic weightare called isotopes. 具有不同原子量的同一种元素被称为同位素. 辞典例句 Who knows theatomic weightof the hydrogen atom? 谁知道氢原子的原子量究竟是 多少 ? 期刊摘选 All uranium atoms do not have the sameatomic weight. ...
The original standard of atomic weight, established in the 19th century, washydrogen, with a value of 1. From about 1900 until 1961,oxygenwas used as the reference standard, with an assigned value of 16. The unit of atomic mass was thereby defined as1/16the mass of an oxygen atom. In ...
the average weight of a molecule of an element or compound measured in units based on 1/12 the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule.Abbr.:mol. wt. [1875–80] Random House Kernerman Webster's College Dictionary, © 2010 K Dicti...
7.The mass of an electron is 1/1850 that of a hydrogen atom.电子的质量是氢原子质量的1850分之一。 8.mass analyzed ion kinetic energy spectrometer(MIKES)质量分析离子动能谱仪 9.component proton precession magnetometer分量质子旋进式磁力仪 10.Quality of life and related factors in middle age intel...
1.That number is the atomic weight—the total number of protons and neutrons in the nucleus of the atom. 2.Hydrogen was the focus of the earlier work because its low atomic weight influences the behavior of vibrations within the material in a way that promotes the formation of superconducting...
For example, water, or H2O, has two hydrogen atoms at 1g each and one oxygen atom at 16g each for a total of 18g/mol. Methane, CH4, has one carbon at 12g each and four hydrogen atoms at 1g each for a total of 16g/mole.Polyethylene,-(C2H4)-1000,has two carbon atoms at 12g eac...
Atomic Mass- Atomic mass is the mass of an atom or other particle, expressed in unified atomic mass units (u). 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 ...