Question

What is the coordination number in a square close packed
structure in two dimensions?
(a) 2 (b ) 3
(c) 4 (d) 6

Answer 1

four

COORDINATION NUMBER- The number of spheres which are touching a given sphere is called the coordination number. In square close-packed layer, a molecule is in contact with four of its neighbours. Therefore, the two-dimensional coordination number of a molecule in square close-packed layer is 4.