Graphene is frequently in news recently. What is its importarice? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct?

1. Statement 1 is correct. Graphene is a single layer of carbon atoms arranged in a hexagonal lattice, making it a true two-dimensional material. It exhibits exceptionally high electrical conductivity. 2. Statement 2 is correct. Being only one atom thick, graphene is one of the thinnest materials known. Despite its thinness, it possesses remarkable tensile strength, making it one of the strongest materials ever tested relative to its weight. 3. Statement 3 is incorrect. Graphene is entirely made of carbon atoms, not silicon. While it does have high optical transparency (absorbing only about 2.3% of white light), the claim about silicon is false. 4. Statement 4 is correct. Due to its unique combination of properties, including high electrical conductivity, high optical transparency, and flexibility, graphene is considered a promising material for use as transparent conducting electrodes in applications such as touch screens, liquid crystal displays (LCDs), and organic LEDs (OLEDs). 5. Therefore, statements 1, 2, and 4 are correct.