University:
Eastern Kentucky University
Course:
CHE 111 | General Chemistry
Academic year:

2022
Views:

257

Pages:

2
Author:

Marin Mason

PART I. Answer the questions based on the above reading. 1. What is an isotope? Isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons. 2. What does the number next to isotopes signify? The number indicates the isotope’s mass number. 3. How can you tell isotopes of the same element apart? They will have a different mass number and different number of neutrons. PART II. For each of the following isotopes, write the number of protons, neutrons, and electrons. Assume all atoms are neutral. Chromium-58 Chromium-63 # of protons 24 24 34 39 24 24 # of neutrons # of electrons # of protons # of neutrons # of electrons Carbon12 Carbon13 Carbon14 6 6 6 6 7 8 6 6 6 Nitrogen-15 Nitrogen-20 # of protons 7 # of neutrons # of electrons 7 8 13 . 7 7 Sodium-12 Sulfur-23 # of protons 11 11 # of neutrons 1 9 # of electrons 11 11 16 16 7 18 16 16 # of neutrons # of electrons Sodium-20 # of protons Sulfur-25 Selenium-50 Selenium-55 # of protons 16 16 34 39 16 16 # of neutrons # of electrons PART III. Fill in the isotope names and any missing information on the chart. Use your periodic table and the information provided. Assume all atoms are neutral. Manganese42 (25 +17) Manganese-40 Germanium62 # of protons 25 25 # of protons 17 15 # of neutrons 25 25 # of electrons # of neutrons # of electrons Iodine-85 Iodine-88 Germanium65 Titani 53 GermaniumTitanium68 53 # of protons # of #protons of neutrons um -22 32 32 # of protons # of #neutrons of electrons 11 33 53 # of neutrons # of electrons 11 32 # of electrons 11 -25 32 35 11 36 53 14 32 11 Germanium64 32 32 30 32 32 32 Cesium- 168 Cesium-166 # of protons 55 55 113 111 55 55 # of neutrons # of electrons