Actinium's the first actinide
I glow in the dark with a pale blue light
Discovered back 1899
And my metal's purified from Actinium Fluoride
The greek work Aktinos means beam or ray
Actinium has 2 meta states
Found in uranium ore by the trace
Besides a neutron source I'm mostly useless

About 150 times as radioactive as Radium
And I'm used to produce the isotope 213 Bismuth for radioimmunotherapy medicine
All actinoids are radioactive, let's get that out of the way
Another 14 songs are coming with little else to say

The actinides are not as similar as the lanthanoids
The IUPAC is recommending they be called the actinoids
Actinides ... Lanthanides, Lanthanoids ... Actinoids
Why all this confusion? Because the suffix -ide refers to ions
Then what's the suffix -oid refer to? Nothing that's why they suggested its use

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