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1Eletron that are located between the valence eletrons and the nucleus.
A.octet of electrons B.subshell c. Orbitals D.core eletrons

2.Proposed an atomic model based on qiantum mechanics
A.schrodinger B.de broglie and schrodinger C.orbitals D.sublevel

3.These are regions or aread around atom
A.Subshell B.principle levels C.orbitals D.sublevel​