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Learning Intentions

• You can to determine average atomic mass for an element using given data about abundance and mass of each isotope of the element. 

Content Standards being covered:

Student understands the structure of matter at the atomic level and the history that lead to our current understanding.
54. Protons and neutrons have a general mass of 1 atomic mass unit (amu), while an electron has a relative mass of 0.0005 amu. Protons and neutrons therefore contribute to an atom's mass and can be added together to determine atomic mass. The electron’s mass is not significant in comparison.
55. An isotope is the same element with different amounts of neutrons and therefore affects the mass of the atom
56. Average atomic mass is a relative atomic mass number that is based on the masses of all known isotopes and their relative abundance in the universe

Habits of Mind/Life skills being covered:

Striving for Accuracy

Journal Entry:

What is the formula for average atomic mass for an element? What is relative abundance?