【正文】
nts (元素週期表 ) Arrange elements in order of atomic numbers ? Elements in the same group have similar properties . Li, Na, K reactive metals group 1 Cl, F, Br reactive gas group 7 He, Ne, Ar inert gas group 8 23 A periodic table Alkali metals 鹼金屬 Other metals 1 2 Alkali earth metals 鹼土金屬 Noble gases 隋性氣體 Transition metals 過(guò)渡金屬 Halogens 鹵素 Rare earth metals 稀土金屬 Other nonmetals solid liquid Gas Synthetic Lanthanides 鑭系 Actinides 系 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 24 Group (族 ) ? Elements in the same group have similar properties ? Group 1: alkali metal 鹼金屬 ? Group 2: alkali earth metal 鹼土金屬 ? Group 7A (17): halogen 鹵素 ? Group 8A (18): noble gas/inert gas 隋性氣體 25 Period (期 ) Period No. of elements 1 2 H, He 2 8 Li ? Ne 3 8 Na ? Ar 4 18 K ? Kr 5 18 Rb ? Xe 6 32 Cs ? Rn 7 inplete Fr ? 26 Blocks Transition Metal 過(guò)渡金屬 (dblock) Innertransition elements, Rare earth metal (fblock) – 1. Lanthanides (鑭系 ) – 2. Actinides Metals (金屬 ) Nonmetals (非金屬 ) Metalloid (semimetal 類金屬 ) – . Si or Ge (鍺 ) are semiconductors. Electron Configurations of elements ? Periodic table