Which statement best describes the quantum mechanical (modern)model of the atom?

• A. The majority of the mass of an atom is outside ofthe nucleus.
• B. Electrons are equally distributed throughout apositively charged core.
• C. Electrons orbit the nucleus in defined orbitslike the planets orbit the sun.
• D. Electron location is described according toorbitals and energy shells.
• E. The exact position and momentum of an electron inan atoms is represented.