Potassium has an atomic number of 19. What OpenStax College Biology

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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