Chemistry

How many elements in the actinide series are not radioactive?

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What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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Which of these is an element?
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What mineral has the chemical formula PbS?
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The red color of rubies is caused mainly by the presence of what element?
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Which of the following is not used in a chemistry lab?
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What is the spontaneous decay of atomic nuclei known as?
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What is a combination of substances that still remain intact?
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Which of the following carbocations is most stable?
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