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In the Hatom , what is the correct order (arrangement) of energy levels​

I believe you mean atom? 1s 2s 2p 3s 3p

This is the correct order of energy levels 1s<2s=2p<3s=3p=3d<4s=4p=4d=4f<5s=5p=5d=5f

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i

Where is the graph ?