Heavy elements emit characteristics X-ray when their electrons undergo transitions. Shown below are the wavelengths of x-rays emitted by some elements:
Element Wavelength (Å)
Cr 2.291
Fe 1.937
Co 1.790
Cu 1.542
Mo 0.7107
If a particular element emits an X-ray with a wavelength of 1.662 Å, determine the identity of the element. Hint: Plot the square root of ν versus the atomic number of the element.