The number of different natural elements found in the universe is closest to
A) 18.
B) 54.
C) 86.
D) 94.
E) 146.
Correct Answer:
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Q7: The best reference source for the atomic
Q8: Which statement about an atom is true?
A)
Q9: The six elements most common in organisms
Q10: Which element has a higher atomic mass
Q11: In the history of the discovery of
Q13: The number of protons in a neutral
Q14: Which pair has similar chemical properties?
A) 12C
Q15: The mass number of an atom is
Q16: What is the difference between an atom
Q17: The atomic number of an element is
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