Final answer:
The electron configuration after 6s² is 1s²2s²2p63s²3p64s¹.
Step-by-step explanation:
The electron configuration after 6s² is 1s²2s²2p63s²3p64s². After filling the 3p sublevel with 6 electrons, the remaining electron goes into the 4s sublevel. The overall electron configuration becomes 1s²2s²2p63s²3p64s¹.