Which of these lists contains only trace elements?
A) sulfur, chlorine, oxygen
B) selenium, hydrogen, calcium
C) boron, oxygen, carbon
D) silicon, fluorine, tin
E) cobalt, calcium, sodium
Correct Answer:
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Q8: By weight, which element is the most
Q9: Given the following approximate values, calculate the
Q10: The "atomic weight" of an atom reflects
Q11: One mole of any element has the
Q12: In any given molecule, the sum of
Q14: The nucleus of an atom consists of
A)
Q15: Which element commonly has only a proton
Q16: _ is a pure substance composed of
Q17: The center of an atom is called
Q18: The "atomic number" of an atom is
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