The opacity of one material made up of this element is equal to pi times the fine structure constant, or roughly 2.3%. That material was first isolated by Geim and Novoselov by using the "Scotch tape" method. One molecule made from this element is made up of twelve pentagons and twenty hexagons. An isotope of this element with eight neutrons has a half-life of around 5,730 years. Buckyballs are made of this element; another substance made up of this element has a value of 10 on the Mohs hardness scale, while another is 
The opacity of one material made up of this element is equal to pi times the fine structure constant, or roughly 2.3%. That material was first isolated by Geim and Novoselov by using the "Scotch tape" method. One molecule made from this element is made up of twelve pentagons and twenty hexagons. An isotope of this element with eight neutrons has a half-life of around 5,730 years. Buckyballs are made of this element; another substance made up of this element has a value of 10 on the Mohs hardness scale, while another is used as pencil lead. For 10 points, name this element used in radioactive dating that makes up graphite and diamonds.
The opacity of one material made up of this element is equal to pi times the fine structure constant, or roughly 2.3%.
Carbon [or C]