5) Each of the following sets of quantum numbers is supposed to specify an orbit

Question

5) Each of the following sets of quantum numbers is supposed to specify an orbital. Choose the one set of quantum numbers that does not contain an error. A) n- 2, 2, ml -+1 C) n 3, 2, mi--3 Don 4, 3, -2 6) For hydrogen, what is the wavelength of the photon emitted when an electron drops from n 4 orbital to n 2 orbital in a hydrogen atom A) 656.3 nm B) 486.2 nm C) 364.6 nm D) 2.057 x 10-3 nm 7) Give the set of four quantum numbers that could represent the last electron added (using the Aufbau principle) to the Cl atom. n-3, 2, ml 1, ms 8) The element that corresponds to the electron configuration ls22s22p63s23p64s23d3 is A) scandium B) manganese C) vanadium D) iron E) cobalt 9) The condensed electron configuration of krypton, element 36, is A) [Kr]4s23d8 B)[Ar]4s4 C) [Krl4s43d8 D) (Ar 3d104s24p6 E) [Ar]4s43d4

Explanation / Answer

(5)

The option (D) is a correct set of quantum numbers, rest all contain errors and are not possible, because l can have values only from 0 to n-1, and m can have values only from -l to +l.

(6)

Correct answer is 486nm, because putting values in the Rydberg formula gives this result

(7)

Correct option is (A), since last electron is added in 3pz orbital, so n=3, l=1, ml=1, ms = +1/2 since the last electron occupies the orbital by itself

(8)

The total number of electrons are 23, according to the electronic configuration. So the element is Vanadium.

(9)

The condensed electronic configuration for Kr is [Ar] 3d10 4s2 4p6

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