Question

what is space lattice and unit cell

Answer 1

space lattice are array of ions,molecules or any other particles which are arranged at different site in 3d spaces and unit cells are the network of each 3d.

Answer 2

“A space lattice is an array of points showing how particles (atoms, ions or molecules) are arranged at different sites in three dimensional spaces.” ... The unit cell may be defined as, “the smallest repeating unit in space lattice which, when repeated over again, results in a crystal of the given substance”.