Vocabulary Entry

radium

|noun

noun

A radioactive element with the symbol Ra and atomic number 88, used in radiation therapy and as a luminescent paint.

Example Sentences

"Radium was once commonly used in early 20th-century luminescent paints."

"The discovery of radium by Marie Curie marked a significant milestone in science."

"Handling radium requires strict safety precautions due to its radioactivity."