Isotope Practice Worksheet, Summaries of Chemistry

Download Isotope Practice Worksheet and more Summaries Chemistry in PDF only on Docsity! Name: Answer Key Class: Gr.11 Isotope Practice 1. Here are three isotopes of an element: 12C 13C 14C a. The element is: Carbon b. The number 6 refers to the Atomic Number c. The numbers 12, 13, and 14 refer to the Mass Number d. How many protons and neutrons are in the first isotope? 6 protons & 6 neutrons e. How many protons and neutrons are in the second isotope? 6 protons & 7 neutrons f. How many protons and neutrons are in the third isotope? 6 protons & 8 neutrons 2. Complete the following chart: Isotope name atomic # mass # # of protons # of neutrons # of electrons Potassium-37 19 37 19 18 19 Oxygen-17 8 17 8 9 8 uranium-235 92 235 92 143 92 uranium-238 92 238 92 146 92 boron-10 5 10 5 5 5 boron-11 5 11 5 6 5 DIRECTIONS: For the following problems, show your work! Be thorough. 3. Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153. Europium- 151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the atomic mass of europium? Answer: 152.04 amu 4. Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Calculate the atomic mass of strontium. Answer: 87.71 amu 5. Titanium has five common isotopes: 46 Ti (8.0%), 47 Ti (7.8%), 48 Ti (73.4%), 49Ti (5.5%), 50Ti (5.3%). What is the average atomic mass of titanium? Answer: 47.92 amu 6 6 6