  We extend the new concept of nonlocalized clustering to the nucleus 10Be with
proton number Z=4 and neutron number N=6 (N=Z+2). The
Tohsaki-Horiuchi-Schuck-R\"opke (THSR) wave function is formulated for the
description of different structures of 10Be. Physical properties such as energy
spectrum and root-mean-square radii are calculated for the first two 0+ states
and corresponding rotational bands. With only one single THSR wave function,
the calculated results show good agreement with other models and experimental
values. We apply, for the first time, the THSR wave function on the chain orbit
({\sigma}-orbit) structure in the 0^+_2 state of 10Be. The ring orbit
({\pi}-orbit) and {\sigma}-orbit structures are further illustrated by
calculating the density distribution of the valence neutrons. We also
investigate the dynamics of ff-clusters and the correlations of two valence
neutrons in 10Be.
