Natural Abundance of Some Elements
The next table gives the isotope distributions for some elements. Some elements like phosphorus and fluorine only exist as a single isotope, with a natural abundance of 100%.
| Isotope | % nat. abundance | atomic mass |
|---|---|---|
| 1H | 99.985 | 1.007825 |
| 2H | 0.015 | 2.0140 |
| 12C | 98.89 | 12 (definition) |
| 13C | 1.11 | 13.00335 |
| 14N | 99.64 | 14.00307 |
| 15N | 0.36 | 15.00011 |
| 16O | 99.76 | 15.99491 |
| 17O | 0.04 | |
| 18O | 0.2 | 17.99916 |
| 28Si | 92.23 | 27.97693 |
| 29Si | 4.67 | 28.97649 |
| 30Si | 3.10 | 29.97376 |
| 32S | 95.0 | 31.97207 |
| 33S | 0.76 | 32.97146 |
| 34S | 4.22 | 33.96786 |
| 37Cl | 24.23 | |
| 35Cl | 75.77 | 34.96885 |
| 79Br | 50.69 | 78.9183 |
| 81Br | 49.31 | 80.9163 |
Read more about this topic: Mass Spectrum Analysis
Famous quotes containing the words natural, abundance and/or elements:
“Suffering is by no means a privilege, a sign of nobility, a reminder of God. Suffering is a fierce, bestial thing, commonplace, uncalled for, natural as air. It is intangible; no one can grasp it or fight against it; it dwells in time—is the same thing as time; if it comes in fits and starts, that is only so as to leave the sufferer more defenseless during the moments that follow, those long moments when one relives the last bout of torture and waits for the next.”
—Cesare Pavese (1908–1950)
“What you desire when young, you have in abundance when old.”
—Johann Wolfgang Von Goethe (1749–1832)
“psychologist
It is through friendships that teenagers learn to take responsibility, provide support, and give their loyalty to non- family members. It is also in teenage friendships that young people find confidants with whom to share thoughts and feelings that they are not comfortable sharing with their parents. Such sharing becomes one of the elements of true intimacy, which will be established later.”
—David Elkind (20th century)