Question

a chemistry graduate student is very skilled at analyzing atomic emission spectra. the print out of her spectrum is printed in black and white. therefore she has to rely on comparing the widths and positions of spectral lines during analysis. observe the various atomic emission spectra. which of the elements shown makes up the unknown spectrum?

Explanation:

Atomic emission spectra are unique to each element. By comparing the widths and positions of spectral lines in the unknown spectrum with those of known elements (hydrogen, helium, sodium, copper, strontium), we can identify the element. In this case, the spectral lines of the unknown match those of copper.

Answer:

Copper