The ground-state static observables and elastic longitudinal (charge) form factors of the 9 Be nucleus in the ground and excited states are considered. The calculations were performed in the framework of the dynamic three-particle 2α+n-model of the 9 Be nucleus with the Pauli projection. The ground state of the 9 Be nucleus has been calculated in two models distinguished by the α-α interaction-model 1 (Ali-Bodmer potential) and model 2 (Buck-Friedrich-Wheatley potential). For the excited states of 9 Be, wave functions with Ali-Bodmer potential for the α-α interaction are utilized.