Which of the following pairs of elements can be classified as noble gases?
A) H and He
B) Na and K
C) Kr and Ar
D) N and O
Correct Answer:
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Q3: A horizontal row of elements on the
Q4: Silicon tetrachloride plays an important role in
Q5: _ are examples of actinides.
A)Ti and Cr
B)U
Q6: The vertical columns in the periodic table
Q9: Ions of opposite charges attract one another.
Q10: The systematic name of AlCl3is aluminum chloride.
Q11: All polymers form rigid solids at standard
Q11: Group II elements (Be, Mg, Ca, Sr,
Q12: The systematic name of V2O5is vanadium pentoxide.
Q18: Cations are particles with fewer electrons than
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