III. Masses of Atoms (p ) Atomic Mass Mass Number Isotopes

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III. Masses of Atoms (p.278-281) Atomic Mass Mass Number Isotopes Ch. 10 - Atomic Structure III. Masses of Atoms (p.278-281) Atomic Mass Mass Number Isotopes

A. Atomic Mass atomic mass unit (u) 1 u = 1/12 the mass of a 12C atom 1 proton = 1 u 1 neutron = 1 u 1 u = 1.67  10-24 g © Addison-Wesley Publishing Company, Inc.

B. Mass Number Sum of the protons and neutrons in the nucleus of an atom. © Addison-Wesley Publishing Company, Inc. Always a whole number. # of neutrons = mass # - atomic #

C. Isotopes Mass # Atomic # Atoms of the same element with different numbers of neutrons. Isotope symbol: Mass # Atomic # “Carbon-12”

C. Isotopes © Addison-Wesley Publishing Company, Inc.

C. Isotopes Average Atomic Mass reported on Periodic Table weighted average of all isotopes Avg. Atomic Mass

C. Isotopes EX: About 8 out of 10 chlorine atoms are chlorine-35. Two out of 10 are chlorine-37. Avg. Atomic Mass 35.4 u