Which of the following elements,essential to life,is a trace element?
A) phosphorus
B) carbon
C) iodine
D) calcium
Correct Answer:
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Q1: An atom with an electrical charge is
Q3: An atom's _ are found in its
Q4: All atoms of an element have the
Q5: The four most common elements found in
Q6: In the following reaction,what type of bond
Q7: Beryllium's atomic mass is 9,and its atomic
Q9: Why is water considered a polar molecule?
A)The
Q11: _ is an example of an element.
A)Water
B)Carbon
C)Glucose
D)Salt
Q13: What name is given to bonds that
Q18: How can radiation be controlled and safely
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