Ok im a noob in quantum mechanics so plz keep the level down for me to understand. My text gives a graph of probability density(ψ^2) of 1s orbital agaisnt distance r - The graph is maximum near the nucleus and then decreases - i always thought electron has max probability at the bohr's radius but the graph seemsto show max near the nucleus. IS it correct. Searching at many places i have actually found two graphs - one which shows maximum at nucleus and then it decreases and other which shows zero at nucleus and then increases upto a point and then decreases Are both different ? Which is correct?