The mass spectrum of an unknown element Y exhibits two peaks at the m/z values and intensities listed in the table.
m/z (amu) Relative intensity (arb. units)
63.0 69.2
65.0 30.8
Assume all ions carry a single positive charge.
(a) Determine the percent abundance of each isotope represented in the spectrum.
(b) Calculate the average atomic mass of element Y to four significant figures.
(c) Using a standard periodic table, identify the element and state one piece of evidence from your calculations that supports your identification.
(d) Briefly explain why the two isotopes of element Y differ in mass yet display identical chemical behavior.