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The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element. Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.

Sections:
00:15 - Understanding the atomic scale
00:48 - Measuring mass with atomic mass units
01:36 - Definition of unified atomic mass unit
02:39 - Mass of protons, neutrons, and electrons
03:31 - Atomic mass and the periodic table
04:27 - Isotopes of hydrogen
05:45 - Atomic mass as a weighted average
07:10 - Average atomic mass vs. atomic weight
07:56 - Relative atomic mass explained

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