Problem: How many atoms and electrons are directly involved in the bond-making and bond-breaking for an SN2 substitution reaction?  (A) two atoms, two electrons  (B) three atoms, two electrons  (C) four atoms, two electrons  (D) two atoms, four electrons  (E) three atoms, four electrons

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How many atoms and electrons are directly involved in the bond-making and bond-breaking for an SN2 substitution reaction? 

(A) two atoms, two electrons 

(B) three atoms, two electrons 

(C) four atoms, two electrons 

(D) two atoms, four electrons 

(E) three atoms, four electrons