relative atomic mass การใช้

• Its relative atomic mass should be around 445 u.
• The electron relative atomic mass can be measured directly in a Penning trap.
• The relative atomic mass of natural uranium is 238.02891 ( 3 ).
• To make a practical realization of the kilogram, a silicon mass spectrometer to determine its average relative atomic mass.
• This gives chlorine a relative atomic mass of 35.5 ( actually 35.4527 g / mol ).
• J鰊s Jacob Berzelius ( 1779 1848 ) was instrumental in the determination of relative atomic masses to ever-increasing accuracy.
• Newlands was the first person to devise a periodic table of chemical elements arranged in order of their relative atomic masses.
• For example, boron from Turkey has a lower relative atomic mass than boron from California, because of its different isotopic composition.
• In 1979, as a compromise, the term " relative atomic mass " was introduced as a secondary synonym for atomic weight.
• In the 1860s Stanislao Cannizzaro refined relative atomic masses by applying Avogadro's law ( notably at the Karlsruhe Congress of 1860 ).
• Twenty years later the primacy of these synonyms was reversed, and the term " relative atomic mass " is now the preferred term.
• As described in " isotopic separation techniques to enrich the silicon until it is nearly pure 28 Si, which has a relative atomic mass of.
• The term " atomic weight " is being phased out slowly and being replaced by " relative atomic mass ", in most current usage.
• With a gold-based definition of the kilogram for instance, the relative atomic mass of gold could have been fixed as precisely, from the current value of.
• In short, the atomic weight ( relative atomic mass ) of carbon varies slightly from place to place and from source to source, a fact that can be useful.
• This is because naturally occurring carbon is a mixture of the isotopes 12 C, 13 C and 14 C which have relative atomic masses of 12, 13 and 14 respectively.
• The atomic mass ( relative isotopic mass ) of an uncommon isotope can differ from the relative atomic mass, atomic weight, or standard atomic weight, by several mass units.
• Transferable properties are distinguished from " conserved properties ", which are assumed to always have the same value whatever the chemical situation, e . g . relative atomic mass.
• The definition deliberately specifies " " "'An " "'atomic weight & ", as an element will have different relative atomic masses depending on the source.
• Explain why the relative atomic mass of carbon, referenced on the periodic table, is not exactly 12 ?  The preceding talk ) 19 : 01, 6 April 2007 ( UTC ).