## Chemical Element

Radium is the chemical element that has $88$ protons in the nuclei of its atoms

Its chemical symbol is $\text {Ra}$.

## Isotopes

### Ra-$226$

Radium-$226$ is the isotope of radium which has $138$ neutrons in addition to its $88$ protons.

U-$226$ is radioactive, with a half-life of approximately $1600$ years.

It has the longest half-life of all the isotopes of radium.

## Linguistic Note

The name radium is derived from the modern Latin, meaning to shed rays.