The most abundant elements in the universe are ________.
A) oxygen and iron
B) hydrogen and helium
C) helium and carbon
D) hydrogen and oxygen
Correct Answer:
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Q37: A pure substance A is found to
Q38: Which of the following statements about compounds
Q39: A pure substance A is found
Q40: In which of the following time periods
Q41: Which of the following statements concerning the
Q43: The most abundant elements in the Earth's
Q44: In which of the following sequences of
Q45: In which of the following sequences of
Q46: In which of the following sequences of
Q47: Which statement is true about elements?
A) Elements
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