Mass spectrometer? Plz help:(

Question

A sample of a pure element is anylazed using a mass spectrometer. The results are Shown below.

Bar one: amu 24 and percent abundance just below 80.

Bar 2: amu 25 and percent abundance 10

bar 3: amu 26 and percent abundance just above 10.

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 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.

Answer 1

A. There are 3 isotopes of the element in the sample.

n²⁴, n²⁵,n²⁶

B. Given that

n²⁴ is 80 amu

n²⁵ is 10 amu

n²⁶ is 10 amu

average mass = 80x24 + 10x25 + 10x26/ 100

Average mass = 24.3 amu

C. From the periodic table Magnesium has 24.3 amu

D. 1s² 2s² 2p⁶ 3s²