protoactinium

ریشه

From the word 'proto-', meaning 'first', and 'actinium', the element it precedes in the periodic table.

مثال

• Protoactinium is a rare and highly unstable element.
• The discovery of protoactinium contributed to the understanding of radioactive decay.
• Protoactinium has various isotopes, with protactinium-231 being the most stable.