Actinium

Pronunciation: /ækˈtɪniəm/

Definitions of actinium

noun a radioactive metallic chemical element with symbol Ac and atomic number 89

Example Sentences

A1 Actinium is a chemical element with the symbol Ac and atomic number 89.

A2 Actinium is a rare earth metal that is silvery-white in color and is found in uranium ores.

B1 Actinium is used in radiation therapy for cancer treatment due to its high radioactivity.

B2 Actinium-225 isotope is being researched for potential use in targeted alpha-particle therapy.

C1 Actinium has multiple isotopes, with actinium-227 being the most stable and commonly used in research.

C2 Actinium is part of the actinide series and is named after the Greek word 'aktinos' meaning 'ray'.

Examples of actinium in a Sentence

formal Actinium is a radioactive element with the symbol Ac and atomic number 89.

informal I heard actinium is a really rare element.

slang Yo, have you ever seen actinium on the periodic table?

figurative Her passion for chemistry was like actinium - rare and powerful.

Grammatical Forms of actinium

• past tense: acted
• plural: actiniums
• comparative: more actinium
• superlative: most actinium
• present tense: actinium
• future tense: will actinium
• perfect tense: have acted
• continuous tense: is acting
• singular: actinium
• positive degree: actinium
• infinitive: to actinium
• gerund: acting
• participle: acted

Origin and Evolution of actinium

First Known Use: 1899 year

Language of Origin: Greek

Story behind the word: The word 'actinium' is derived from the Greek word 'aktinos' meaning 'ray' or 'beam'.

Evolution of the word: Initially, actinium was used to refer to the element with atomic number 89. Over time, the word has continued to be used in the field of chemistry to describe the radioactive metallic element.