جميع المواضيع المتعلقة بـ ‘and the transuranium’

 

Actinide elements

The series of elements beginning with actinium (atomic number 89) and including thorium, protactinium, uranium, and the transuranium el­ements through the element lawrencium (atomic number 103). These elements have a strong chemical resemblance to the lanthanide, or rare-earth, elements of atomic numbers 57 to 71. Their atomic numbers, names, and chemical symbols are: 89, ac­tinium (Ac), the prototype element, sometimes not included as an actual member of the…

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