If both the K and L shells are full, what would be the atomic number of that element? HomeAtomic Structure MCQsIf both the K and L shells are full, what would be the atomic number of that element? Share your love WhatsApp Facebook Telegram Twitter Pinterest 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