Teachers. About Us. Contact Us. There are three types of rock. 1. Igneous: these are rocks that solidified directly from molten silicates, which geologists call magma. Examples are: granite, basalt, pumice and flint (which is a form of quartz).2.eachers. About Us. Contact Us. There are three types of rock. 1. Igneous: these are rocks that solidified directly from molten silicates, which geologists call magma. Examples are: granite, basalt, pumice and flint (which is a form of quartz).
Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having the chemical formula PCl3. It has a trigonal pyramidal shape. It is the most important of the three phosphorus chlorides.
Transcript: Hi, this is Dr. B. Let's do the Lewis structure for CH2F2: difluoromethane. On the periodic table, Carbon is in group 4, it has 4 valence electrons. Hydrogen, group 1, but we have 2 Hydrogens.Fluorine, 7 valence electrons, we have 2 of those as well, for a total of 20 valence electrons.We'll put the Carbon at the center, and then Hydrogens always go on the outside.luorine needs 8, this Fluorine has 8 and this Fluorine has 8. And then Carbon, in the center, needs 8, and it has 8. So we've used all the valence electrons. Everything has full outer shells. That is the Lewis structure for CH2F2. This is Dr. B., and thanks for watching.