There аre three nаturаlly оccurring isоtоpes of the element X (shown below). Find the atomic weight (in amu) using the correct number of significant figures. Do not enter units in your response. 28X: 27.97693 amu - 92.23% abundant 29X: 28.97649 amu - 4.683% abundant 30X: 29.97377 amu - 3.087% abundant