Structure of Atom

JEE Main 2024 (Online) 27th January Morning ShiftNumericalEasy📈 Topic in 17% papers+4

Ques. 1JEE Main 2024, 27 January (Morning Shift)

The number of electrons present in all the completely filled subshells having n = 4 and s = + 12 is . (Where n = principal quantum number and s = spin quantum number)

Answer

Solution

n = 4 ⇒ subshells 4s, 4p, 4d, 4f (completely filled)

∵ each filled orbital has one electron with s = + 12 ⇒ count = number of orbitals

4s : 1, 4p : 3, 4d : 5, 4f : 7

∴ Total = 1 + 3 + 5 + 7 = 16 (= n2)

Answer: 16

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Ques. 2JEE Main 2024, 27 January (Evening Shift)

Total number of ions from the following with noble gas configuration is . Sr2+ (z = 38), Cs+ (z = 55), La2+ (z = 57), Pb2+ (z = 82), Yb2+ (z = 70) and Fe2+ (z = 26)

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