Question 3 / 10:  Potassium has an atomic number of 19. What is its electron configuration?
a.  shells 1 and 2 are full, and shell 3 has nine electrons
b.  shells 1, 2 and 3 are full and shell 4 has three electrons
c.  shells 1, 2 and 3 are full and shell 4 has one electron
d.  shells 1, 2 and 3 are full and no other electrons are present
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Biology 02 The Chemical Foundation of Life MCQ

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