Why is He positioned above Ne in the periodic table?
A) They both have the same atomic mass.
B) They both have the same number of electrons in their outermost orbital.
C) They both have a full outermost orbital.
D) They both have the same atomic number.
E) They both have the same number of protons in their nuclei.
Correct Answer:
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Q2: How many elements occur naturally?
A) 112
B) 92
C)
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Q7: Ca3(PO4)2 represents a(n)
A) element.
B) mixture.
C) compound.
D) isotope.
E)
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A) Na
B)
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