An atom of particular element is traveling at 2.0%of the speed of light with a wavelength of 3.31 x 10-3 pm. Which element is this? Select one: O a. Ca O b. Ar OCE d. Ne e. Br Based on Lewis structure, what is the structure of SF4, indicate if the molecule is polar or not? Select one: O a. distorted tetrahedral (see-saw), polar O b. tetrahedral, none polar O c. square planar, no- polar d. T- shape, polar e. trigonal bipyramidal , polar