Which does not have a noble gas configuration? A. Sc3+ B. Ar C. O2- D. K I answered A.Sc3+ which ended up being wrong.  I need to know how to find the answer.  And apparently I don't know what a noble gas configuration is if I got the answer wrong.

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Atomic Structure

The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.

Shape of the D Orbital

Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.