An x-ray diffractometer recorder chart for an element that has either the BCC or the FCC crystal structure showed diffraction peaks at the following 2angles: 38.60, 55.71, 69.70, 82.55, 95.00, and 107.67. (Wavelength of the incoming radiation was 0.15405 nm.) (a) Determine the crystal structure of the element. (b) Determine the lattice constant of the element.