Isotopes

All atoms of the same element posses the same no. of protons and electrons but not neccarily the same no. of neutrons. So all atoms of an element will react in the same way, but they can differ in their molecular masses. Atoms of the same element with different masses are known as isotopes. Hydrogen has three isotopes. 99.98% of all hydrogen has one proton and one electron, while 0.02% of hydrogen has one proton, one neutron and one electron. This isotope is called deuterium. There is also a trace of a third isotope, tritium, which has two neutrons in its nucleus. ...

Isotopes

Two or more nuclides having the same atomic number, thus constituting the same element, but differing in the mass number. Isotopes of a given element have the same number of nuclear protons but differing numbers of neutrons. Naturally occurring chemical elements are usually mixtures of isotopes so that observed (non-integer) atomic weights are aver...
Found on https://www.encyclo.co.uk/local/20039

Isotopes

Two atoms having the same number of protons but different numbers of neutrons are said to be isotopes of each other. See also: Abundance Ratio, Calutron, Daughter Isotope, Parent Isotope.
Found on http://www.diracdelta.co.uk/science/source/i/s/isotopes/source.html

isotopes

Isotopes are two or more nuclides with the same atomic number Z but different mass number A. The term is sometimes used synonymously with nuclide, but it is preferable to reserve the word nuclide for a species of specific Z and A.
Found on http://www.ktf-split.hr/periodni/en/abc/i.html

isotopes

Atoms of the same element with differing numbers of neutrons.
Found on http://www.chemicalglossary.net/definition/942-Isotopes

isotopes

All atoms of the same element posses the same no. of protons and electrons but not neccarily the same no. of neutrons. So all atoms of an element will react in the same way, but they can differ in their molecular masses. Atoms of the same element with dif
Found on http://www.chemicalglossary.net/definition/948-Isotopes

isotopes

Elements with the same number of protons but have different numbers of neutrons, and thus different masses.
Found on http://www.chemicalglossary.net/definition/984-Isotopes

isotopes

Elements with the same number of protons but have different numbers of neutrons, and thus different masses.
Found on http://www.shodor.org/UNChem/glossary.html

Isotopes

Atoms of the same element having the same chemical properties but differing in mass and in the physical properties that depend on their mass.
Found on http://www.blackwellpublishing.com/Townsend/Glossary/GlossaryI.html

isotopes

Atomic species differing in mass number but having the same atomic number. ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

Isotopes

Two or more nuclides having the same atomic number, thus constituting the same element, but differing in the mass number. Isotopes of a given element have the same number of nuclear protons but differing numbers of neutrons. Naturally occurring chemical elements are usually mixtures of isotopes so that observed (non-integer) atomic weights are aver...
Found on http://isotopes.lbl.gov/education/glossary/glossaryf.htm

isotopes

nuclides having the same atomic number but different mass numbers
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-02-37

Isotopes

Two or more forms of atoms of the same element with different masses; atoms containing the same number of protons but different numbers of neutrons.
Found on http://www.chemistry-dictionary.com/definition/isotopes.php

isotopes

Atoms with the same atomic number but different numbers of neutrons; indicated by adding the mass number to the element's name, e.g., carbon 12 or 12C.
Found on https://www.encyclo.co.uk/local/21571

Isotopes

Atoms of an element that have the same number of electrons and protons but different numbers of neutrons.
Found on http://www.bgs.ac.uk/discoveringGeology/glossary.html

Isotopes

Atoms with the same atomic number but different numbers of neutrons; indicated by adding the mass nu
Found on http://www.superglossary.com/Glossary/Science/Biology/

Isotopes

These are atoms of an element having the same atomic number but different atomic weights.
Found on http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter
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