Chemistry
What element has an atomic number of 40?
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What metal is known for the chemical compounds it forms, such as emeralds and aquamarines?
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What symbol appears on the periodic table for Thorium which has the atomic number 90?
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What symbol appears on the periodic table for the element with the atomic number 14?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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What three components are needed in order to produce fire?
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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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