鍀者,又曰鎝,化學元素也,符號Tc,原子序四十三,屬過渡金屬。色銀灰而類鉑,粉狀色灰。
皆具放射性,稱放射元素者,以之為小,凡言人工製之至細者,亦非之莫屬。
一九三六年十二月,意人卡羅·佩里爾、埃米利奧·吉諾·塞格雷製得之。
同位素者廿一,迨鍀八五至鍀一一八,皆具放射性。
較之錳錸,其性稍穩,易共價而難生離子矣。常見氧化數者有三:曰正四、正五、正七矣。
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