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Radioactive isotopes may also be classified as stable isotopes when their half-lives are too long to be measured. These elements can often be found to occur in nature and include isotopes of carbon, nitrogen, hydrogen, oxygen, noble gases and metals. For example, there are a lot of carbon atoms in the universe. The normal ones are carbon-12.


If an isotope undergoes radioactive decay very, very slowly, it may be termed stable. An example is bismuth-209. Bismuth-209 is a stable radioactive isotope that undergoes alpha-decay but has a half-life of 1.9 x 10 19 years (which is more than a billion times


Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Every chemical element has one or more isotopes. An atom is first identified and labeled according to the number of protons in its nucleus.


Examples of radiogenic isotopes include argon-40 and hydrogen-4. Lesson Summary The isotopes of an element are like different versions of an element - they have the same number of protons but ...


Types of Isotopes & Their Uses ... For example, in geochemistry, scientists study the chemical composition of geological materials such as minerals and rocks. Stable isotopes are dependable tools for determining many facts about geological materials, such as their age and where they came from.


Examples of isotopes are O-16, O-17 and O-18. These isotopes can be used in forensics, but are even more accurate in their ability to tell whether a certain rock originated on Earth, Mars or even an asteroid. Oxygen isotopes can also tell how the oceans have been heating up or cooling down over eons.


Isotopes are elements have the same atomic number (number of protons) but differ in their number of neutrons (and therefore atomic weight). All elements form isotopes, although some only have one, or even no stable isotopes. For example carbon has...


Two nuclides are isotones if they have the same neutron number N, but different proton number Z.For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones.Similarly, 36 S, 37 Cl, 38 Ar, 39 K, and 40 Ca nuclei are all isotones of 20 because they all contain 20 neutrons. Despite its similarity to the Greek for "same stretching", the term was formed by the Germa...


As discussed, atomic number is the unique property by which we can determine the element. Therefore, the atomic number 6 of carbon in all the forms is constant. Carbon-12 is the stable isotope of the carbon element whereas carbon-14 is the radioactive isotope. Examples of Isotopes. Isotopic forms of Oxygen – Oxygen -16, Oxygen -17, Oxygen -18


This chemistry video tutorial answers the question - what are isotopes? Isotopes are substances that are composed of the same element but consist of different mass numbers and number of neutrons.