Span classnews_dt17092012spannbsp018332why is carbon12 used as the reference isotope so the atomic mass of carbon12 is defined to be 12 exactly and all other atomic.
Carbon 6 c has 15 known isotopes from 8 c to 22 c of which 12 c and 13 c are stable the longestlived radioisotope is 14 c with a halflife of 5700 years this is also the only carbon radioisotope found in naturetrace quantities are formed cosmogenically by the reaction 14 n 1 n 14 c 1 h.
atomic number and atomic mass unit unit for atomic or molecular mass and 1 amu is 112 th the mass is the basis of the carbon14 dating technique.
An atomic mass unit symbolized amu or amu is defined as precisely 112 the mass of an atom of carbon12 the carbon12 c12 atom has six.
The atomic mass unit or amu is 112 the mass of one atom of carbon12 an atomic mass unit has the mass of 160221415 1023 grams according to howstuffworks.
The atomic mass unit is defined as 112th the mass of a carbon12 atom was there any physical reason for such a definition were they trying to include electrons in.
An atomic mass unit is a physical constant equal to onetwelfth of the mass of an unbound atom of carbon12.
Span classnews_dt09102008spannbsp018332what is the mass in amu of a single carbon12 atom add these numbers together to get the average atomic mass atom is usually given in the unit.
Atomic redster carbon cl uni s redwh 17 atomic sns access 17.