Question

state auf bau principle​

Answer 1

Aulfbau principle:

The subshell with minimum energy is fillied up first and when this obtains maximum number of electrons,the next subshells of higher energy starts filling....

(or)

In simple,

First ,The electrons should be enter into the lowest energy orbital....

Hope!!! it helps you...

Answer 2

$\sf\underline\pink{ Auf~bau~principle}$ :- In the ground state of the atoms, the orbitals are filled with electrons, in their increasing order of energies.