Which of the following statements about the atmosphere is true? ...

[wrbasek0]

Which of the following statements about the atmosphere is true?
 
  A) The overall composition of the atmosphere has not changed with time.
  B) The component of air that makes it reactive is the element nitrogen.
  C) The hydrogen in the atmosphere is what makes it flammable.
  D) The atmosphere does not have much mass.
  E) none of the above

Question 2

The total number of electrons that can be accommodated in 3d is ________.
 
  A) 5
  B) 2
  C) 6
  D) 10

[sarahccccc]

Answer to Question 1

E

Answer to Question 2

D