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 NI3, Nitrogen Triiodide. That's one of Dr. B.'s favorite chemicals: big explosion, nice purple cloud. So let's look on the periodic table.Nitrogen is in Group 5, sometimes called fifteen, so it has five valence electrons. And then for Iodine we have seven valence electrons but there's three of them so 5 + 21 = 26 total valence electrons. Let's put Nitrogen in the center.It is the least electronegative.o let's look on the periodic table. Nitrogen is in Group 5, sometimes called fifteen, so it has five valence electrons. And then for Iodine we have seven valence electrons but there's three of them so 5 + 21 = 26 total valence electrons. Let's put Nitrogen in the center. It is the least electronegative.