Chemistry

What is the half-life of Rubidium-Strontium 87?

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Which of these is a liquid?
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Which element has the chemical symbol Ca?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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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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What halogen is the most reactive and combines with most elements from around the periodic table?
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What major chemical other than chlorine is used to purify water of microorganisms?
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Which will have the smallest increase in temperature for the same amount of heat?
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What was Avogadro's number?
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