Question 1 Which one of the following configurations depicts an excited oxygen a

Question

Question 1 Which one of the following configurations depicts an excited oxygen atom? 1s22s22p 1s22s22p23s2 1s22s22p1 1s22s22p He]2s22p4 Question 2 Which one of the quantum numbers does not result from the solution of the Schrodinger equation? principal O azimuthal magnetic O spin O angular momentum Question 3 Which two elements have the same ground-state electron configuration? Pd and Pt Cu and Ag OFe and Cu O CI and Ar O No two elements have the same ground-state electron configuration. Quest onch diectron contiguration represents a violation of the Paull xctusion principle? 1s 2s 1s 2s 2p 1s 2s 2p ??| |? ? | |11| ? | ? ls 2s ls 2s Question5 Which one of the following represents an impossible set of quantum numbers for an electron in an atom? (arranged as n,

Explanation / Answer

1)

ans)

oxygen atom

atomic number =8=no.of electrons

now from options

1s^2,2s^2,2p^2=6 electrons

1s^2,2s^2,2p^2,3s^2=8 electrons(exited state)

1s^2,2s^2,2p^1=5

1s^2,2s^2,2p^4=8(ground state)

[He]2s^2,2p^4=8(ground state)

hence exited oxygen atom eletronic configuration is

option b

3)

ans)

option e

no 2 elements have the same ground state electron configuration because at the ground state, each element has a different number of electrons so the configurations will all be different

4)

ans)

option A is the answer

Explanation: The Pauli Principle: No two electrons in an atom can have the same set of all four quantum numbers, n, l, m, and ms.

For atoms with more than one electron, we must take account of a fourth quantum number, ms, the electron
spin quantum number, which has only two values, ms = ±1/2

In option A both electrons in 2s orbital has same direction i.e ms =+1/2 for both which violates Pauli's principle

6)

option c

K (ar)4s1

7)

the uncertainitry principle states that

it is impossible to know the exact position and the momentum of an electron

option c

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