Atomic # = 20 protons=20 Atomic Mass Instructions: 1. Find the atomic mass unit of Sulfur-32 with a mass of 31.972 and percent abundance 94.99%, Sulfur-33 with a mass of 32.971 and percent abundance 0.75%, Sulfur-34 with a mass of 33.968 and percent abundance 4.25%, and Sulfur-36 with a mass of 35.967 and percent abundance 0.01%. 2. Find the atomic mass unit of Silicon-28, Silicon-29, Silicon-30 with masses of 27.977,28.976, 29.974, respectively. The percent abundance of the silicon isotopes is 92.2%, 4.7% and 3.1%, respectively