One Isotope of Carbon Has Exactly the Same Mass Number

Here Nᵒ represents the number of atoms of the isotope in the sample at t0 or when the organism a part of whom now forms the sample died while N represents the number of atoms left after time t has passed. For 12 C the atomic mass is exactly 12u since the atomic mass unit is defined from it.

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For some isotope mass difference is 1.

. So there will be some fraction of molecules that will be heavier than expected parent mass. The equation dictates the decay of a radioactive isotope. These differences are exhibited as multiple peaks in mass spec.

For example 63 Cu 29 protons and 34 neutrons has a mass number of 63 and an isotopic mass in its nuclear ground state is 6291367 u. Remember that the ratio of C-14 to C-12 atoms in the organism and the environment is the same when it is. For other isotopes the isotopic mass usually differs and is usually within 01 u of the mass number.

For others mass difference is 1. Every atom in a molecule has a chance of being one of these isotopes.

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