  Transfermium nuclei (101$\leq$Z$\leq$110) are investigated thoroughly to
describe structural properties viz. deformation, radii, shapes, magicity, etc.
as well as their probable decay chains. These properties are explored using
relativistic mean-field (RMF) approach and compared with other theories along
with available experimental data. Neutron numbers N$=$152 and 162 have come
forth with a deformed shell gap whereas N$=$184 is ensured as a spherical magic
number. The region with N$>$168 bears witness of the phenomenon of shape
transition and shape coexistence for all the considered isotopic chains.
Experimental $\alpha$-decay half-lives are compared with our theoretical
half-lives obtained by using various empirical/semi-empirical formulas. The
recent formula proposed by Manjunatha \textit{et al.}, which results best among
the considered 10 formulas, is further modified by adding asymmetry dependent
terms ($I$ and $I^2$). This modified Manjunatha formula is utilized to predict
probable $\alpha$-decay chains that are found in excellent agreement with
available experimental data.
