👤

Which of the following is correctly distributed? 
a. 1s² 2s² 2p⁶ 3s¹ 3p¹
b. 1s² 2s² 2p⁵ 3s²
c. 1s ² 2s² 2p⁵
d. 1s² 2s¹ 2p⁶​