Atomic Mass Na The atomic mass of an element

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Presentation transcript:

Atomic Mass Na 22.99 The atomic mass of an element is listed below the symbol of each element on the periodic table. gives the mass of an “average” atom of each element compared to 12C. is not the same as the mass number. Na 22.99

Isotopes of Some Elements and Their Atomic Mass Most elements have two or more isotopes that contribute to the atomic mass of that element.

Atomic Mass of Magnesium The atomic mass of Mg is due to all the Mg isotopes. is a weighted average. is not a whole number.

Atomic Mass for Cl The atomic mass of chlorine is due to all the Cl isotopes. not a whole number. the average of two isotopes: 35Cl and 37Cl.

Learning Check Using the periodic table, specify the atomic mass of each element. A. calcium __________ B. aluminum __________ C. lead __________ D. barium __________ E. iron __________

Solution Using the periodic table, specify the atomic mass of each element: A. calcium 40.08 amu B. aluminum 26.98 amu C. lead 207.2 amu D. barium 137.3 amu E. iron 55.85 amu