Question

Explain Aufbau principle with the help of electronic configuration of the element with atomic number 21.

Answer 1

Explanation:

The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s shell is filled before the 2s subshell is occupied. In this way, the electrons of an atom or ion form the most stable electron configuration possible. An example is the configuration 1s2 2s2 2p6 3s2 3p3 for the phosphorus atom, meaning that the 1s subshell has 2 electrons etc.

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Answer 2

Answer:

Aufbau principle tells us the order of filling of orbital or in short their energy levels.