• # question_answer A unit cell with edge length $a\ne b\ne c$ and axial angles $\alpha =\beta =\gamma =90{}^\circ$ is called A) cubic B) tetragonal C) orthorhombic      D) hexagonal

 A unit cell with edge length $a\ne b\ne c$and axial angles $\alpha =\beta =\gamma =90{}^\circ$ is called orthorhoinbic, e.g. rhombic sulphur, $KN{{O}_{3}}$$BaS{{O}_{4}}$