Hybridisation $ = \frac{1}{2}$ [Number of valence electrons of central atom + no. of monovalent atoms attached to it + negative charge if any - positive charge if any] $= \frac{1}{2} \left[6+4+0-0\right] =5=sp^{3}d $ $ \left[\because Te \left(52\right)=\left[Kr\right]4d^{10}5s^{2}5p^{4}\right] $
Vector Quantity is a physical quantity that is specified not only by its magnitude but also by its direction. A vector quantity whose magnitude is equal to one and has direction is called a unit vector.