Consider the following collection of subshells in spectroscopic notation: 5s¹, 1d¹, 4s³, 3p⁷, 5g¹⁵. Which of these are actually allowed subshells?
a. 3p⁷
b. 1d¹
c. 5g¹⁵
d. 5s¹
e. 4s³

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