Which of the following statements is true concerning the electron configuration [Ar]4p2? A. This configuration is...

Which of the following statements is true concerning the electron configuration [Ar]4p²?

	A.	This configuration is the ground-state electron configuration for a Ca atom.
	B.	This configuration cannot be the ground-state electron configuration for a Ca atom because it violates Hund's rule.
	C.	This configuration cannot be the ground-state electron configuration for a Ca atom because it violates the Aufbau principle.
	D.	This configuration cannot be the ground-state electron configuration for a Ca atom because it violates the Pauli exclusion principle.
	E.	This configuration cannot be the ground-state electron configuration for a Ca atom because it violates the Heisenberg uncertainty principle.

Expert Solution

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

BECAUSE ACOORDING TO THIS AUFBAU PRINCIPLE,

in the ground state of an atom ,an electron enters the orbitals of lowest energy of first and subsequent electrons are fed in the increasing order of their energies

in the given case thelectrons enter into 4p-orbitals with out entering the lowest energy 4S-orbital.hence it violates the aufbau principle.

queen_honey_blossom answered 2 years ago

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