Bean Bag Isotope: Abundance and Atomic Mass Lab Essay

1323 Words Feb 28th, 2013 6 Pages
A new atomic theory, in which all atoms of the same element are identical to one another and equal in mass, was proposed by the scientist Dalton. Although the theory had its flaws and was simple, it was revolutionary. Scientists became able to study the actual structure and mass of atoms after the discovery of radioactivity. Soon, isotopes were discovered, as atoms of the same element which have been built up to have different masses.
The purpose of this lab is to investigate the mass properties and relative abundance of isotopes for the “bean bag” element (symbol, Bg), and to calculate the atomic mass of this element.
Equipment and Materials
Balance centigram (0.01-g
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Each atom has its own abundance percentage, and the atomic mass is an average of all the masses. As a result, the atoms would not have the same mass as the calculated atomic mass, but they would probably have very similar masses.

The isotopes of magnesium (and their percent abundance) are Mg-24 (79.0%), Mg-25 (10.0%), and Mg-26 (11.0%). Calculate the atomic mass of magnesium. Note: To one decimal place, the mass

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