Define unit cell and paramagnetic substance.

Explanation

Unit cell : The smallest repeating unit in lattice which when repeated over and over again they produce the complete crystal lattice.
Paramagnetic Substance : The property by virtue of which ce rtain substance are very the substance are called weakly attracted by magnetic field called, paramagnets and paramagnetic substance.
For Example: D10xygen `(O_2), Cu^(2+), Fe^(3+), Cr^(3+), atc.`