Which one of the following elements has an allotrope that is produced in the upper atmosphere by lightning?
A) He
B) N
C) S
D) Cl
E) O
Correct Answer:
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Q8: Of the following elements, which has the
Q9: Of the following elements, which has the
Q10: Screening by core electrons in atoms is
Q11: Which element would be expected to have
Q12: Alkali metals tend to be more reactive
Q14: Nonmetals can be at room temperature.
A) solid
Q15: Which one of the following is not
Q16: This element is more reactive than lithium
Q17: Alkaline earth metals _ .
A) exist as
Q18: Which of the following correctly lists the
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