Isotopes are atoms of the same element that differ in the number of neutrons.
The target nucleus and the product nucleus are isotopes, or forms of the same element.
In its sleuthing, the lab studies such things as a sample's isotopes -- atoms of the same element that have different numbers of neutrons.
They look at geology, fossils, and the chemical makeup of sediments, particularly chemical isotopes - different atoms of the same element that differ minutely in their mass.
As radioisotopes are identical chemically with stable isotopes of the same element, they can take the place of the latter in physiological processes.
The word "isotope" comes from the Greek, "iso" meaning the same, and "topos" meaning place, because different isotopes of the same element occupy the same place in the periodic table.
I had learned as a small child that diamond and graphite were different forms, allotropes, of the same element, and I vividly remembered how my shining tin soldiers had been transformed one winter into a gray dust: "tin pest".
Finally, each word and phrase and formula is compared with every recurrence of the same element or elements elsewhere, and all variations in the physical and the linguistic contexts are recorded.
He also showed that in rock salt the two kinds of atoms, sodium and chlorine, are arranged alternately, so that atoms of the same element never touch each other.
(Species of the same element characterized by the same nuclear charge, Z [number of protons], but differing in their number of neutrons [and therefore in mass number A] are called isotopes. Species that have the same mass number, A, but differ in Z are known as isobars).
First, electrons shared by two atoms of the same element are divided equally; accordingly, elements are always in oxidation state of 0, regardless of their allotropic form (allotropic refers to the phenomenon of an element's having two or more forms; e.g., carbon can exist as diamond or graphite and in both cases is in the 0 oxidation state).
