Natural AbundanceIntroduction to Natural Science, Fall 2006 Chemistry Workshop – Week 3 1. Determine the element name, number of protons, electrons and neutrons for the following elements. Element symbol Element name # of protons # of electrons # of neutrons Pb 20782 Mn 5525 Si 2814 Kr 8436 Ne 2010 2. Obtain the atomic weight of the following elements. Pay attention to units. element Atomic weight Zn Co Ar B F 3. The natural abundances of the isotopes of germanium are given below with their atomic masses. Calculate the average atomic weight of germanium. Isotopes Natural Abundance Atomic mass (amu) Ge 7032 20.52% 69.9243 Ge 7232 27.43% 71.9217 Ge 7632 7.76% 75.9214 Ge 7432 36.54% 73.9219 Ge 7332 7.76% 72.9234 4. Calculate the number of moles and the number of atoms in each of the following. • 12.36 g of Fe • 78.54 g of Cu • 12.35 g of Mg5. find 2 examples for each of the following • liquid elements • metals • non-metals • halogens • alkali earth metals • metalloids • alkali metals • transition elements • lanthanides • actinides • noble gases 6. Calculate the number of grams in each of the following. • 3.5 moles of neon • 8.56 moles of beryllium • 12.39 moles of
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