Card 4 / 14: 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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