GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

Atomic Mass (Simplified)

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The atomic mass of an element can be found on the Periodic Table.

Determining Atomic Mass

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Atomic Mass (Conceptual) Concept 1

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Atomic Mass (Conceptual) Example 1

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On the Periodic Table, the atomic mass is represented by the number with decimal places.

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Problem

Which of the following choices has the greatest atomic mass?

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Atomic Mass (Simplified) Concept 2

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Atomic Mass (Simplified) Example 2

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Problem

Only three isotopes of magnesium exist on earth. 24Mg is the most common form at 78.70% natural abundance with a mass of 23.98504 amu, 25Mg has a 10.13% natural abundance, while 26Mg has a natural abundance of 11.17% and a mass of 25.98259 amu. What is the mass of the 25Mg isotope?

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Problem

Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?