Consider the following statements:
1) Nano means 10^–9 so that nano materials have an order of dimension higher than the size of atom and come in the form of rods, tubes, spheres or even thin sheets/films
2) Nano materials have enchanced of changed structural property
3) Nano elements lend themselves to mechanical processing like rolling, twisting, positioning
4) Nano elements show important electrical, magnetic and optical characteristics that are useful in electrical inductry
Which of the above statements are correct?