• The Periodic Table and Isotopes (Abundance) The periodic table only tells us a weighted average of the atomic masses of the different isotopes for an element. For example, if we take a weighted average for the isotopes of Carbon, we get an average atomic mass of 12.011 amu. Like Carbon, many elements exist in nature as a mixture of isotopes.
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  • Isotope name atomic #mass ## of protons# of neutrons# of electrons. 92 uranium-235 92 uranium-238 5 boron-10 5 boron-11. Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153.
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Worksheet Answer Key Do ... - Teacher Worksheets Answer key for radioactive decay 2 showing top 8 worksheets in the category answer key for radioactive decay 2. Click on pop out icon or print icon to worksheet to print or download. Radioactive elements decay at different rates from fractions of seconds to millions and billions of years.
ISOTOPES, IONS, AND ATOMS WORKSHEET 2 Atomic # Mass # # p+ # e- # n0 charge Symbol 1) 14 16 +4 2) 75 36 42 3) 51 54 79 4) 99 252 96 5) 208 Pb2+ 82 6) 52 76 -2 7) 113 48 49 8) 42 98 +6 9) 17 N3- 7 10) 209 83 +5 11) 110 Pd 46 12) 124 50 +4

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29. Honors Chemistry Worksheet – Atomic Structure Answer Key. Provide the best, complete, detailed, and concise response to each of the following questions/problems. Write neatly on a separate sheet of paper. Use the text chapters on atomic structure and electronic configuration/structure to assist in answering. 1. What is the modern atomic ...

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