Question #2

They're many ways of identify and categorize elements. The few we learned is electron configuration and spectroscopy. Electron configuration is the arrangement of electrons or any other physical structure. Electron configuration is how electrons are distributed on the orbitals. By the electrons in the last orbital they can tell which block a element should be in(s, p, d, f). It was first conceived by the Bohr model of the atom. Now, Spectroscopy is the study of interaction between radiation and matter as a wavelength. Spectroscopy is the use of visible light according to its wavelength. They're different types of spectroscopy the ones involving atoms usually use the range of electromagnetic spectra in which a substance emits or absorbs. Using the electromagnetic spectra scientist categorize elements based by how much they emit or absorb. Americium was placed were it was because of its electron configuration its last level orbital put it in block f and the amount put it were it is now. On the spectroscopy it absorbed or release enough energy to put in the lower half of the periodic table.