: An innovative method which is called as full modified nonlocal (FMNL) theory has been presented in this research. The basic idea of FMNL theory is deriving an inverse operator of nonlocal operator, namely modified nonlocal operator. Then by applying the modified nonlocal operator to the nonlocal constitutive equation, modified nonlocal constitutive equation is obtained. In FMNL theory, modified nonlocal constitutive equation is used instead of nonlocal constitutive equation. Based on modified nonlocal constitutive equation, stress is expressed as an explicit function of strain. This caused to elimination the paradoxes of nonlocal (NL) which is clearly explained in this research. Afterwards bending analysis of simply supported rectangular nanobeams and nanoplates based on FMNL theory is studied. First, governing equation and boundary conditions are derived by using variational method. Then by rearranging the infinite series of the maximum bending deflection, the sum of the mentioned series and its radius of convergence is computed. This leads to eliminate the truncation error as shown in the results. Numerical results are obtained by using the Navier method and they compare with MD results to confirm the validity of FMNL theory. Moreover, the numerical results if the first two term of series of modified nonlocal operator is considered which is called as primary nonlocal (PMNL) theory, is derived. Comparing the results of FMNL and PMNL theory demonstrated that for small enough of value of small scale parameter, the first two term of series of modified nonlocal operator is an appropriate approximation for the mentioned series. Hence, PMNL theory is suitable for bending analysis of nanobeams and nanoplates for small enough of value of small scale parameter. Keywords: Full Modified Nonlocal Theory (FMNL), Bending, Buckling, Nanoplate, Nanobeam
