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www.thoughtco.com/definition-of-isotopes-and-examples-604541

For example, an isotope with 6 protons and 6 neutrons is carbon-12 or C-12. An isotope with 6 protons and 7 neutrons is carbon-13 or C-16. Note the mass number of two isotopes may be the same, even though they are different elements. For example, you could have carbon-14 and nitrogen-14.

study.com/academy/lesson/what-are-isotopes-definition-types-examples.html

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 ...

www.softschools.com/examples/science/isotopes_examples/470

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.

answers.yahoo.com/question/index?qid=20110904093501AAZoeM4

Which of the following is a pair of isotopes? a) 14 C- 14 N b) 23 Na- 24 Mg c) 1H-2H d) 81 Br - 35 Cl e) 19F - 7Li The number to the right of each letter is the atomic mass, and you derive the atomic number from the periodic table. Count each, and subtract one from the other. The way I understand the definition of an isotope is they are atoms that have an unequal amount of neutrons to protons.

sciencing.com/types-isotopes-uses-8571746.html

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.

www.britannica.com/science/isotope

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.

www.answers.com/Q/What_represents_a_pair_of_isotopes

A pair of isotopes are elements that have a different mass than how they are naturally found in nature. This is a different mass from that shown in the periodic table.

brainly.com/question/1412072

Isotopes are substances that have the same number of protons but differ in the number of neutrons. Hence, the pair of isotopes above should be of the same element. In the given choices, 14C is not an isotope of 14N. 206Pb is an isotope of 208 Pb.

brainly.in/question/268916

Explain why a large negative value for the standard reduction potential indicates a half-cell that is likely to undergo oxidation The most and least eletronegative elements among the following pairs :1.oxygen,fluorine 2.fluorine,oxygen3.fluorine, cesium 4.carbon,fluorine Iron nails are put in copper sulphate solution which one of the following ...

www.youtube.com/watch?v=0YVEFQ88zpw

This video explains exactly what isotopes are and what they are not. It gives examples that show you what to look for to tell if a pair represents an isotope.