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Author Question: Fluorine has an atomic number of 9 and a mass number of 19. How many electrons a (Read 1319 times)

Hawke

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on: May 25, 2013
Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?
A) 1
B) 3
C) 0
D) 7
E) 9


coco

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Reply #1 on: May 27, 2013
Answer: A


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