Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?
A) nitrogen
B) calcium
C) iodine
D) sodium
E) phosphorus
Correct Answer:
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Q9: Which of the following statements is False?
A)Atoms
Q10: Oxygen has an atomic number of 8
Q11: Electrons exist only at fixed levels of
Q12: An atom with an atomic number of
Q13: What is the approximate atomic mass of
Q15: Three or four of the following statements
Q16: Which of the following best describes
Q17: The mass number of an element can
Q18: About 25 of the 92 natural elements
Q19: One difference between carbon-12 (
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