Question

Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in :
(a) Cu and Zn
(b) Co and Zn
(c) Mn and Cr
(d) Cu and Cr

Answer 1

the answer to this questions is

D

Answer 2

Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in Cu and Cr

Explanation:

The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

$Cr:24:1s^22s^22p^63s^23p^64s^13d^5$

$Cu:29:1s^22s^22p^63s^23p^64s^13d^{10}$

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