Atomic Symbols, Atomic Numbers, and Mass Numbers

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

By
11.29.04

Last Updated 05.23.15

By
11.29.04

Last Updated 05.23.15

By
11.29.04

Last Updated 05.23.15
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Atomic Symbols, Atomic Numbers, and Mass Numbers has been viewed 44,589 times.

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Posted by Robben Nacimento on 3/20/2015 12:58:49 AM Votes 0.00

Why is the letter A used to denote mass number?

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  • I believe the "a" represents an Atomic mass unit (amu): A unit used to express the mass of an atom equal to exactly one-twelfth the mass of a carbon-12 atom.

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    Posted by Tom Thiel on 3/20/2015 9:08:28 AM Votes 0.00
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I love the format - I would like to see more exercises.

Posted by Dee Shonkwiler on 10/16/2011 2:03:00 PM Reply