Modern periodic Table IA 3 151617 3A 4A 5A 6A 7A HI 6 3B SB 6B 7B 8B IB 2B 1 21 Period I M 46 51 Nb Mo Te Ru Rh A d In sb oD n At R 7)1;8 Metals s岛劉〓闢 Lu Metalloids s;Ⅻc黜 2.4Period Group Alkali Metal Noble Gas Halogen Alkali Earth Metal 2.4