Chemistry

What actinide was once used to power pacemaker batteries, but has since been replaced?

More Questions from Chemistry
What symbol appears on the periodic table for Calcium which has the atomic number 20?
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What are the building blocks of matter called?
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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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Which of these is an element?
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Reacting an organic acid with a primary alcohol yields which of the following products?
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What particle has a positive charge of 1 unit?
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What symbol appears on the periodic table for the element with the atomic number 100?
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Which of these objects has the most mass?
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