text: This element reacts directly with chloromethane in the aptly named direct process, discovered by Rochowand MÃ¼ller.
full_question: This element reacts directly with chloromethane in the aptly named direct process, discovered by Rochowand MÃ¼ller. This element is the second-lightest to take on, in pure form, the crystal described as twointerpenetrating fcc lattices. A very pure form of this element is created using the Siemens process. TBS andTIPS belong to a class of protecting groups characterized by an ether of this element. This element, boron, andoxygen constitutes Pyrex glass. It's the element most commonly crystallized using the Czochralski (chokhRAL-skee)process. Because it has the same number of valence electrons, it can replace carbon in compounds.For 10 points, identify this semiconductor with atomic number 14. 
first_sentence: This element reacts directly with chloromethane in the aptly named direct process, discovered by Rochowand MÃ¼ller.
raw_answer: silicon [or Si]