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.
Certain rules seem to govern the formation of stable isotopes. 1  A proton cannot be attached directly to another proton on the end of a chain. 2  A neutron cannot be on the end of a chain. 3  No more than two neutrons can lie in sequence. 4  For large elements, more neutrons are required, and subject to rule 3.