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en.wikipedia.org/wiki/Isotope

The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of protons and neutrons. From left to right, the isotopes are protium (1 H) with zero neutrons, deuterium (2 H) with one neutron, and tritium (3 H) with two neutrons.

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

List the mass number of an element after its name or element symbol. 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.

www.merriam-webster.com/dictionary/isotope

Isotope definition is - any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties.

www.dictionary.com/browse/isotope

Isotope definition, any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms.

www.collinsdictionary.com/dictionary/english/isotope

Isotope definition: Isotopes are atoms that have the same number of protons and electrons but different... | Meaning, pronunciation, translations and examples. Log In Dictionary. Thesaurus. Translator. Grammar. English. Dictionary Grammar Blog School Scrabble Thesaurus Translator Quiz More Resources More from Collins.

www.thefreedictionary.com/isotope

Define isotope. isotope synonyms, isotope pronunciation, isotope translation, English dictionary definition of isotope. n. One of two or more atoms having the same atomic number but different mass numbers. i′so·top′ic adj. i′so·top′i·cal·ly adv. n one of two or more atoms...

www.ducksters.com/science/chemistry/isotopes.php

Heavier isotopes tend to react more slowly than lighter isotopes of the same element. Deuterium (the hydrogen isotope with one neutron) can form water with oxygen. This is called "heavy water" as deuterium has twice the mass of normal hydrogen (protium). There are 254 known stable isotopes and 80 elements which have at least one stable isotope.

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.

www.youtube.com/watch?v=wMx1l86XFLU

This two minute video explains what isotopes are, using Carbon-12, Carbon-13 and Carbon-14 as examples. Find more free tutorials, videos and readings for the science classroom at ricochetscience.com.

www.chemicool.com/definition/isotopes.html

Definition of Isotopes. What is an Isotope? Elements are defined by the number of protons in the atomic nucleus. For example, an atom with 6 protons must be carbon, and an atom with 92 protons must be uranium. In addition to protons, the atoms of nearly every element also contain neutrons. The mass of a neutron is almost identical to that of a ...