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Author Question: The atomic nucleus contains A) yogurt. B) protons only. C) neutrons and electrons. D) ... (Read 17 times)

erika

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  • Posts: 522
on: Jul 29, 2018
The atomic nucleus contains
 
  A) yogurt.
  B) protons only.
  C) neutrons and electrons.
  D) protons and neutrons.
  E) protons and electrons.

Question 2

At Chernobyl, one of the harmful radioactive isotopes was 131I, a beta emitter with a halflife of 8 days. The mass number of the nucleus that remains after this isotope decays is
 
  A) 132. B) 129. C) 131. D) 127. E) 130.


mjenn52

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  • Posts: 351
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

B


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