What does isotopically mean?
(Chemistry) one of two or more atoms with the same atomic number that contain different numbers of neutrons.
What is the mass of lighter isotope?
An imaginary element (Atomic weight 93.7140) has three naturally-occurring isotopes with isotopic weights of 92.9469, 93.2923 and 94.9030. The abundance of the lightest isotope is 42.38 %.
What are light stable isotopes?
These are the so-called “light isotopes” of the elements of C, N, H, O, and S. These five atomic elements comprise the primary building blocks of all components of the biosphere (plants, animals), the hydrosphere (water), and the atmosphere (gaseous N2, O2, H2O).
What is a heavy isotope?
In isotope science, a “heavy isotope” is the stable isotope or stable isotopes of an element, which are heavier than the most abundant isotope. For instance, 18O is considered as heavy oxygen, compared to the most abundant 16O.
How many isotopes are there?
Isotope Facts All elements have isotopes. There are two main types of isotopes: stable and unstable (radioactive). There are 254 known stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes.
How do you tell if an isotope is stable or unstable?
A stable isotope is one that does not undergo spontaneous nuclear decay. An unstable isotope is one that does undergo spontaneous nuclear decay.
Which isotope is the heaviest?
It has 83 protons and a magic number of 126 neutrons, and an atomic mass of 208.9803987 amu (atomic mass units). Primordial bismuth consists entirely of this isotope….Bismuth-209.
| General | |
|---|---|
| Half-life (t1/2) | 2.01×1019 years |
| Isotope mass | 208.9803987 u |
| Spin | 9/2− |
| Excess energy | −18258.461±2.4 keV |
Why are isotopes heavier?
The less abundant stable isotope(s) of an element have one or two additional neutrons than protons, and thus are heavier than the more common stable isotope for those elements.