Atomic Masses

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q Average Atomic Mass (AAM)

This is the weighted average mass of all atoms of

an element, measured in a.m.u.

For an element with

isotopes A, B, etc.:

AAM = Mass A (% A) + Mass B (% B) + …

% abundance

(use the decimal form of the %;

e.g., use 0.253 for 25.3%)

Chapter 5: The Periodic Law 5.1 History of the Periodic Table I. M

HISTORY OF THE DEVELOPMENT OF THE ATOMIC MODEL

Unit 4: Chemical Bonding and Molecular Structure Chapter 6 Notes ...

2012 brochure cross country - Copy - Siegel High School

Average Atomic Mass • weighted average of all isotopes • on the Periodic Table • round to two decimal places Avg. Atomic Mass = (mass)(%) + (mass)(%) (% in decimal form)

q Average Atomic Mass (AAM) This is the weighted average mass of all atoms of an element, measured in a.m.u. For an element with isotopes A, B, etc.: AAM = Mass A (% A) + Mass B (% B) + … % abundance (use the decimal form of the %; e.g., use 0.253 for 25.3%)

Page 1: Atomic Masses Chemist in the 1800's
Page 5 and 6: Average Atomic Mass • EX: Calcula
Page 7 and 8: Mass Spectrophotometer magnetic fie
Page 9 and 10: Mass Spectrum for Mercury (The phot
Page 11 and 12: Isotope U-234 U-235 U-238 Mass % ab
Page 13 and 14: Hyphen Notation • Put the mass nu

Atomic Masses

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