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In the probability density graphs of s and p and even other orbitals start from nucleus as shown in the picture given below

enter image description here

they all start from nucleus i.e. there is good probability of electrons of the particular orbitals being there.

my doubts:

  1. there is proper energy variation and differences of energies of electrons being in particular orbital, example, energy of 2p will be greater than 2s etc. and as i think energy of electron is due to its position with respect to nucleus. as in the diagram probability regions of 1s 2s and 2p is same {though value of y coordinate is small} then how can there energies be different?

  2. don't the electron clouds of 1s , 2s , 2p intermix? moreover electron cloud- a 3D SPACE which must be wide enough to get electrons at different distances from nucleus doesn't violate the rule that electron has one constant energy in one orbital.

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    $\begingroup$ Energy is associated to the orbital not to a specific r $\endgroup$ – Alchimista Sep 25 '17 at 15:29

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