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Q14: What type of biological compound is a
Q28: Which of the following is a radioactive
Q30: What is the chemical formula for lithium
Q84: Which of the following is a solid
Q117: In 1861 a green line was observed
Q148: How many neutrons are in the nucleus
Q163: Which element has the following electron configuration:
Q167: What are the predicted products from the
Q178: Which of the following is separated into
Q195: What is the term for the elements