Which of the following statements is true concerning the electron configuration

ID: 878538 • Letter: W

Question

Which of the following statements is true concerning the electron configuration [Ne]3p2?

A.This configuration cannot be the ground-state electron configuration for a Mg atom because it violates the Heisenberg uncertainty principle.

B.This configuration cannot be the ground-state electron configuration for a Mg atom because it violates the Pauli exclusion principle.

C.This configuration is the ground-state electron configuration for a Mg atom.

D.This configuration cannot be the ground-state electron configuration for a Mg atom because it violates Hund's rule.

E.This configuration cannot be the ground-state electron configuration for a Mg atom because it violates the Aufbau principle.

Which of the following statements is incorrect?

A.Stern and Gerlach discovered electron spin by passing silver atoms through a magnetic field.

B.The building-up principle states that electrons are added to atoms in order of increasing principal quantum number.

C.The Pauli exclusion principle states that each electron in an atom must have its own unique set of quantum numbers.

D.Valence electrons consist of those electrons not contained within a noble-gas core or a pseudo-noble-gas core.

E.Hund's rule states that electrons are placed in the orbitals of a subshell in such a way as to give a maximum number of unpaired electrons.

Which of the following have one or more filled d subshells in their ground state electron configuration?

A.Al

B.Si

C.Mn

D.Ga

E.Sc

1) option E

E.This configuration cannot be the ground-state electron configuration for a Mg atom because it violates the Aufbau principle.

Mg electron configuration = [Ne] 3s2

2) D.Valence electrons consist of those electrons not contained within a noble-gas core or a pseudo-noble-gas core.

3) options C,D,E

Mn - electron configuration = [Ar] 4s2 3d5

Ga - electron configuration = [Ar] 3d10 4s2 4p1

Sc - electron configuration = [Ar] 3d1 4s2

so these three atoms having one or more filled d subshells in their ground state electron configuration

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