  A theoretical investigation on the shape transitions with neutron number,
temperature and spin for A $=$100 isobars of Z$=$42 to 50 is presented. A
variety of shape transitions are observed while moving from neutron rich 100 Mo
to proton rich 100 Sn with predominant triaxial shapes. Temperature and spin
induced shape transitions are explored within the microscopic theoretical
framework of and statistical theory of hot rotating nuclei. Prolate
non-collective which is a rare shape phase is reported in this mass region on
the proton rich side of the nuclear chart.
