Home ยป If both the K and L shells are full, what would be the atomic number of that element? Atomic Structure MCQs If both the K and L shells are full, what would be the atomic number of that element? January 8, 2022 10 Views Q. If both the K and L shells are full, what would be the atomic number of that element? A. 20 B. 14 C. 10 D. 16 Answer: 10