Chemistry

What symbol appears on the periodic table for Thorium which has the atomic number 90?

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What is essential for calcium absorption by the human body?
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Which of these is used to determine the strength of a chemical bond?
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What symbol appears on the periodic table for the element with the atomic number 22?
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Who is considered the "father" of organic chemistry?
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Which of the following is a metal?
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Whose laws are used to prove the Ideal Gas law?
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What is the name of the temperature at which Helium I becomes Helium II?
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Which of these objects has the most mass?
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