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Author Question: Elements in the same group have A) the same atomic number. B) the same number of neutrons. C) ... (Read 48 times)

craiczarry

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on: Aug 27, 2018
Elements in the same group have
 
  A) the same atomic number.
  B) the same number of neutrons.
  C) the same number of electrons.
  D) the same number of valence electrons.

Question 2

If the half-life of an isotope is 5 hr, the amount of 20.0 g remaining after 15 hr will be ________.
 
  A) 2.5 g
  B) 5.0 g
  C) 6.67 g
  D) 10.0 g


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amandanbreshears

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

D

Answer to Question 2

A


craiczarry

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Reply 2 on: Aug 27, 2018
Excellent

dantucker

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Reply 3 on: Yesterday
Wow, this really help

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