How Is It Possible to Deduce the Identity of an Element

Multiple Choice

How is it possible to deduce the identity of an element from its electron configuration?

A) The number of occupied shells corresponds to the atom's atomic number.
B) If the atom is electrically neutral,the number of electrons corresponds to the atom's atomic number.
C) Using the periodic table,the outermost occupied shell indicates the group while the number of occupied shells indicates the period.
D) An electron configuration is unique to each element,much like its atomic spectrum.