Of the elements Na, Mg, Si, S, Cl, and Ar, identify one that fits each of the following: (4.2, 4.6, 4.7, 4.8) a. largest atomic size b. a halogen c. electron configuration 1s 2s 2p 3s 3p MATOU d. highest ionization energy e. in Group 6A (16) f. most metallic character g. two valence electrons