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

The total number of electrons in the fourth energy level is __________.

a. 8
b. 18
c. 32
d. 50

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