What is true about electrons in the modern model of atom?
(A) they are contained within the nucleus itself
(B) their position can be accurately determined
(C) they circle the nucleus in perfectly round orbits
(D) their position can be predicted using probability
Electrons are found in the cloud surrounding the nucleus, therefore a is wrong. You can only assume their general location, thus B is wrong. C describes the Bohr model, which is quite old and disproven. D is your answer.
