The minute particles of two of the substances for many years classed as elements give off electrons; uranium and thorium are radioactive. Electrons are produced by sending an electric discharge through very small traces of different gases, using electrodes of different metals. Electrons are also produced by exposing various metals to the action of ultraviolet light, and by raising the temperature of various metals to incandescence.According to this passage,

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The minute particles of two of the substances for many years classed as elements give off electrons; uranium and thorium are radioactive. Electrons are produced by sending an electric discharge through very small traces of different gases, using electrodes of different metals. Electrons are also produced by exposing various metals to the action of ultraviolet light, and by raising the temperature of various metals to incandescence.<br>According to this passage,