Which of the following is the electron configuration of an electrically neutral atom of argon (Ar)?
(a) 1s² 2s² 2p5
(b) 1s² 3d¹⁰ 4f⁷
(c) 1s² 2s² 2p⁶ 3s² 3s⁶
(d) 1s² 2s1
![Which of the following is the electron configuration of an electrically neutral atom of argon Ar a 1s 2s 2p5 b 1s 3d 4f c 1s 2s 2p 3s 3s d 1s 2s1 class=](https://us-static.z-dn.net/files/d63/d8f6f9378bc3d322d2e87bf0c7063d58.jpg)