The electron density in an atom extends far beyond the nucleus. In practice, we normally think of atomic size as the volume containing about____percent of the total electron density around the nucleus.

Options

A. `100`
B. `80`
C. `70`
D. `90`

Answer

D

Explanation

The probability density `|psi|^(2)` has always some value, howsoever small it may be, at any finite distance form the necleus. It is, therefore, not possible to draw a boundary surface diagram of a rigid size in which the probability of finding the electorn is `100%`