What is the basis for exceptions to the aufbau principle?
electron spins are more important than energy levels in determining electron configuration.
some elements have unusual atomic orbitals.
ment
filled and half-filled energy sublevels are more stable than partially-filled energy sublevels.
electron configurations are only probable.
model

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist