Which of the following elements is a noble gas?
A) oxygen
B) chlorine
C) bromine
D) argon
E) nitrogen
Correct Answer:
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Q1: Select the correct symbol for the element
Q2: The elements lithium,sodium,and potassium _.
A)are isotopes of
Q3: Select the correct symbol for the element
Q5: Which of the following elements is a
Q6: The Group 8A (18)elements _.
A)are unreactive and
Q7: Which of the following properties is not
Q8: Select the correct symbol for the element
Q9: What elements are in hydroxyapatite, 
Q10: Select the correct symbol for the element
Q11: Which of the following elements is a
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