For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate.
A sample of a pure element is analyzed using a mass spectrometer. The results are shown below.
(a) How many different isotopes of the element were in the sample?
(b) Describe how to use the information from the mass spectrum to determine the average atomic mass of the element.
(c) Identify the element.
(d) Write the ground-state electron configuration of an atom of the element that you identified in part (c).
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a is the answer please make brain list
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