Radioactive element
Crossword Clue and Answers

Crossword Answers

5 letters

RADON
A radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

6 letters

RADIUM
An intensely radioactive metallic element that occurs in minute amounts in uranium ores

CERIUM
A ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group

7 letters

THORIUM
A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

URANIUM
A heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

8 letters

ACTINIUM
A radioactive element of the actinide series; found in uranium ores

ASTATINE
A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

RUBIDIUM
A soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite

9 letters

PLUTONIUM
A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239