1) What is the electron configuration of an electrically neutral atom of sodium?

2) What is the electron configuration of an electrically neutral atom of neon?

3) What is the electron configuration of an electrically neutral atom of oxygen?

Base on the question, the possible answer to your questions are the following and I do hope that you are satisfied with my answer and feel free to ask for more if you have questions and clarification

#1 1s2 2s2 3p6 1s

#2 1s2 2s2 3p6

#3 1s2 2s2 3p4