actinium 

  1. 名詞
不可數名詞: 錒

    
                        
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例句

                

                    
    
                                                    
  1. 
                                Actinium also has two meta states.                            
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  2. 
                                The strongest base is of actinium .                            
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  3. 
                                Dr. Dave also joined the Board of Directors of Actinium .                            
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                                Actinium is a soft, silvery-white, radioactive, metallic element.                            
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  5. 
                                Secondary decay products of thorium include radium and actinium .                            
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