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JEE Main levelNumerical answerDifficulty 2 of 3as139

What is the maximum number of electrons in an atom that can occupy orbitals having $n + l = 5$ ?

Numerical answer type, tolerance 0.01.

Answer: 18

Subshells with

n + l = 5

: 5s (

n = 5, l = 0

), 4p (

n = 4, l = 1

), 3d (

n = 3, l = 2

). Orbitals:

1 + 3 + 5 = 9

. Electrons:

2 \times 9 = 18

.

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