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Even--even nuclei in the $A\sim100$ mass region are investigated within theframework of the interacting boson model-1 ({IBM-1}). The study includes energyspectra and electric quadrupole transition properties of zirconium, molybdenum,ruthenium and palladium isotopes with neutron number $N\geq52$. A globalparametrization of the {IBM-1} Hamiltonian is found leading to a description ofabout 300 collective levels in 30 nuclei with a root-mean-square deviation fromthe observed level energies of 120 keV. The importance of the $d_{5/2}$subshell closure at neutron number N=56 is pointed out. The geometric characterof the nuclei can be visualized by plotting the potential energy surface$V(\beta,\gamma)$ obtained from the {IBM-1} Hamiltonian in the classical limit.The parametrization established on the basis of known elements is used topredict properties of the unknown, neutron-rich isotopes $^{106}$Zr,$^{112}$Mo, $^{116}$Ru and $^{122}$Pd.

Description of nuclei in the A$\sim$100 mass region with the interacting boson model