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Unformatted text preview: 3.7 Isotopes 1. Defining Isotopes i. Atoms of the same element that have different masses ii. All elements of the same element have the same # of protons, but may vary in the number of neutrons iii. Although isotopes have different masses, they do not differ significantly in their chemical behavior iv. Hydrogen as an example: Image from http://encarta.msn.com/media_461531710/hydrogen_isotopes.html Updated: 11/22/2011 2. Designating Isotopes a. Hyphen notation i. Mass number is written after the name of the element 1. Hydrogen-2 2. Helium-4 b. Nuclear Symbol i. Composition of the nucleus using the elements symbol ii. For example, H 2 1 Mass number = 2 Atomic number = 1 He 4 2 Mass number = 4 Atomic number = 2 Name Symbol Atomic number Mass number Neutrons sodium 11 23 nitrogen N 15 7 Ba 136 56 lithium boron 5 11 Updated: 11/22/2011...
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