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nouna soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores
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- william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
- crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
- sir william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)