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Author Question: An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have? ... (Read 139 times)

HCHenry

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on: Jul 27, 2018
An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?
 
  a. 11
  b. 12
  c. 23
  d. 34
  e. 35

Question 2

Why is the ozone layer in Earth's atmosphere important to life on its surface?
 
  What will be an ideal response?


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sierrahalpin

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

b

Answer to Question 2

The ozone layer in the upper atmosphere protects the lower atmosphere and Earth's surface from harmful solar UV photons.


HCHenry

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


sierrahalpin

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


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