# Bean Bag Isotope

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I. Bean Bag Isotope II. The purpose of this experiment is to investigate the mass properties and relative abundance of isotopes for the “bean bag” element and to calculate the atomic mass of this element. III. Pre-Lab Questions A. The first possible property of electrons and protons that led to their discovery was their “positive rays,” positively charged streams of atoms generated in gas discharge tubes from J.J. Thomson’s experiment. When these positive rays were bent of deflected in the presence of electric and magnetic fields and then allowed to strike a film, they left curved spots. B. Si-28 Protons- 14 Electrons- 14 Neutrons- 14 Si-29- Protons- 14 Electrons- 14 Neutrons- 15 Si-30 Protons- 14 Electrons- 14 Neutrons- 16 C. This is false, because the atomic mass of chlorine is the average mass of the all isotopes. IV. We sorted the beans into three isotope groups (1,2, and 3) according to the type of bean. We counted and recorded the number of Bg atoms in each isotope group. We then measured the total mass of Bg atoms belonging to each isotope group, we recorded each mass to the nearest 0.01 g in the data table . V. Data Table ￼￼￼￼ Results Table ￼￼￼￼ VI. Calculations and Conclusions A. 2.83/15 = 0.1887 12.8/44 = 0.2909 19.2/63 = 0.3048 B. 12.3 36.1 51.6 C. Atomic Mass = (0.123 x 0.1887) + (0.361 x 0.2909) + (0.516 x 0.3048) Answer: 0.2855 g D. None of the Bg atoms in the original sample would’ve been expected to have the same mass as the calculated atomic mass of the element because the Atomic mass is only the average of the different masses. E. 24.32 F. 63) (x) + (65) (1 - x) = 63.5 --- Cu-63=75% Cu-65=25% G. The atomic mass of copper is not exactly equal to 64 because the percent abundance isn’t equal. H.