Constants 1 Periodic Table v Part A Silicon has three naturally occurring isotopes Si-28 with mass 27 9769 amu and a natural abundance of 9221 % Si-29 with mass 2B 9765 arran and a natural abundance of 4 69 %, and Si-30 with mass 299737 amu and a natural abundance of 310%. Calculate the atomic mass of silicon Express your answer using four significant figures. Atomic Mass = aniu Submit