Home ยป What is the Atomic Number of the Element with 1s2, 2s2, 2p6, 3s2, 3p3 Electronic Configuration? Periodic Table MCQs What is the Atomic Number of the Element with 1s2, 2s2, 2p6, 3s2, 3p3 Electronic Configuration? April 16, 2022 17 Views Q. What is the Atomic Number of the Element with 1s2, 2s2, 2p6, 3s2, 3p3 Electronic Configuration? A. 34. B. 49. C. 31. D. 33. Answer: 33.