action - something that you do protective - (being) something that protects protective action - things you do, to protect yourself or other people (from something) recomâ¦mendations - someone has done some research; this is a list of what they think is good protective action recommendations - a list of things someone thinks you should do to protect ...
Stable isotope analysis gives an independent measure of fractionation such that if, for instance, a sample is 1.5% heavier in 13C than modern standard carbon through the effects of fractionation, then it will be 3% heavier in 14C than it would have been had fractionation not taken place.
The mass number of an isotope is determined by the total number of neutrons and protons in the nucleus. Stable Chemical Elements. A stable chemical element is one that contains an optimal ratio or range of ratios between the number of protons and neutrons in the nucleus.able 6 lists the elements, and the symbol, atomic weight and atomic number of each. The atomic number of an element is determined by the number of protons in the nucleus of an atom of the element.