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Author Question: Which of the features is seen on the surface of Europa? A) impact craters B) giant cracks C) ... (Read 108 times)

Metfan725

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on: Jul 27, 2018
Which of the features is seen on the surface of Europa?
 
  A) impact craters
  B) giant cracks
  C) water ice
  D) all of these are seen

Question 2

The most common isotope of gold has atomic number 79 and atomic weight 197.
 
  How many protons and neutrons does the gold nucleus contain? Assuming the gold is electrically neutral, how many electrons does it have? If the gold is triply ionized, how many electrons does it have?


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Hikerman221

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

The most common isotope of gold contains 79 protons and 118 neutrons. If it is neutral, it also contains 79 electrons. If the gold is triply ionized instead, it is missing 3 electrons and so has only 76 electrons.


Metfan725

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Reply #2 on: Jul 27, 2018
Thank you!


Hikerman221

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Reply #3 on: Jul 27, 2018
Always glad to help...


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