Write the Aufbau building up principle from lowest to heighest energy level
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-The lowest energy sublevel is always the 1s sublevel, which consists of one orbital. The single electron of the hydrogen atom will occupy the 1s orbital when the atom is in its ground state.

-The highest energy according to Aufbau principle, or n+l rule, n=3, l=2 has maximum energy because 3+2=5 which is maximum.

law of conservation of matter

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