Basic Theory:The electron density is the essential Probability of finding electron 1 in dx1,electron 2 in dx2,...electron N in dxN: |Ψ(x1,x2,…,xw)l2dx1dx2.dxw Integrating over the space and spin coordinates of electron 2,3,...,N and the spin coordinate of electron 1 one obtaines the probability of finding electron 1 in volume element dr whilst the other electrons are anywhere: (-∫axz.w)Pdsa.dwan Multiplying by N one obtaines the probability of finding any electron in dr1: v(-∫lw,x,xw)Ids.dxzdxx）ah=p)an The quantity p(r1)is the electron density: v-6 .)ds,dx…dwBasic Theory: The electron density is the essential