錒
錒（粵拼：Aa3，Actinium）係種放射性元素，化學符號係Ac，來自拉丁文名Actinium。佢個原子序數係89，屬於錒系元素之一。佢可以由鈾元素演變而成。
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| 1 | H 氫 | He 氦 | |||||||||||||||||||||||||||||||
| 2 | Li 鋰 | Be 鈹 | B 硼 | C 碳 | N 氮 | O 氧 | F 氟 | Ne 氖 | |||||||||||||||||||||||||
| 3 | Na 鈉 | Mg 鎂 | Al 鋁 | Si 矽 | P 磷 | S 硫 | Cl 氯 | Ar 氬 | |||||||||||||||||||||||||
| 4 | K 鉀 | Ca 鈣 | Sc 鈧 | Ti 鈦 | V 釩 | Cr 鉻 | Mn 錳 | Fe 鐵 | Co 鈷 | Ni 鎳 | Cu 銅 | Zn 鋅 | Ga 鎵 | Ge 鍺 | As 砷 | Se 硒 | Br 溴 | Kr 氪 | |||||||||||||||
| 5 | Rb 銣 | Sr 鍶 | Y 釔 | Zr 鋯 | Nb 鈮 | Mo 鉬 | Tc 鎝 | Ru 釕 | Rh 銠 | Pd 鈀 | Ag 銀 | Cd 鎘 | In 銦 | Sn 錫 | Sb 銻 | Te 碲 | I 碘 | Xe 氙 | |||||||||||||||
| 6 | Cs 銫 | Ba 鋇 | La 鑭 | Ce 鈰 | Pr 鐠 | Nd 釹 | Pm 鉕 | Sm 釤 | Eu 銪 | Gd 釓 | Tb 鋱 | Dy 鏑 | Ho 鈥 | Er 鉺 | Tm 銩 | Yb 鐿 | Lu 鑥 | Hf 鉿 | Ta 鉭 | W 鎢 | Re 錸 | Os 鋨 | Ir 銥 | Pt 鉑 | Au 金 | Hg 汞 | Tl 鉈 | Pb 鉛 | Bi 鉍 | Po 釙 | At 砹 | Rn 氡 | |
| 7 | Fr 鈁 | Ra 鐳 | Ac 錒 | Th 釷 | Pa 鏷 | U 鈾 | Np 錼 | Pu 鈈 | Am 鋂 | Cm 鋦 | Bk 鉳 | Cf 鉲 | Es 鑀 | Fm 鐨 | Md 鍆 | No 鍩 | Lr 鐒 | Rf 鑪 | Db 𨧀 | Sg 𨭎 | Bh 𨨏 | Hs 𨭆 | Mt 䥑 | Ds 鐽 | Rg 錀 | Cn 鎶 | Nh 鉨 | Fl 鈇 | Mc 鏌 | Lv 鉝 | Ts 鿬 | Og 鿫 | |
| 8 | Uue 119 | Ubn 120 | * | Ute 139 | Uqn 140 | Uqu 141 | Uqb 142 | Uqt 143 | Uqq 144 | Uqp 145 | Uqh 146 | Uqs 147 | Uqo 148 | Uqe 149 | Upn 150 | Upu 151 | Upb 152 | Upt 153 | |||||||||||||||
| * | Ubu 121 | Ubb 122 | Ubt 123 | Ubq 124 | Ubp 125 | Ubh 126 | Ubs 127 | Ubo 128 | Ube 129 | Utn 130 | Utu 131 | Utb 132 | Utt 133 | Utq 134 | Utp 135 | Uth 136 | Uts 137 | Uto 138 | |||||||
| 鹼金屬 | 鹼土金屬 | 鑭系元素 | 錒系元素 | 過渡金屬 | 主族金屬 | 類金屬 | 非金屬 | 鹵素 | 惰性氣體 | 化學特性未知 | 預料元素 |
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