SELECT * FROM question_mgmt as q WHERE id=1316 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

(a) How many sub-shells are associated with n = 4?

(b) How many electrons will be present in the sub-shells having ms value of –1/2 for n = 4?

Answer:

(a) n = 4 (Given)

For a given value of ‘n’, ‘l’ can have values from zero to (n – 1).

∴ l = 0, 1, 2, 3

Thus, four sub-shells are associated with n = 4, which are s, p, d and f.

 

(b) Number of orbitals in the nth shell = n2

For n = 4

Number of orbitals = 16

Each orbital has one electron with ms = -1/2

Hence there will be 16 electrons with ms = -1/2


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