1. How many bravais lattices are there in two-dimensions? (a) 14 (b) 7 (c) 3 (d) 5 2. In the diagram below, which is not an acceptable form for a 2D unit cell? 3. (a) (b) (c) (d) . ' How many lattice points are there per unit cell in a hexagonal-closed packed crystal of pure zinc? (a) 7 (b) 2 (c) 1 (d) 15