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How to Write the Formula for Phosphorus trichloride
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In this video we'll write the correct formula for Phosphorus trichloride (PCl3). To write the formula for Phosphorus trichloride we’ll use the Periodic Table and follow some simple rules. • When we have a non-metal and a non-metal we have a molecular compound (sometimes called covalent). Molecular compounds are some of the simplest to name. • Keys for Writing the Formulas for Molecular Compounds: • Write the element symbol for both elements. • Place a subscript after each element according to its prefix. • Note: Don’t write the subscript '1'. • --------- • Prefixes • mono- 1 • di- 2 • tri- 3 • tetra- 4 • penta- 5 • hexa- 6 • hepta- 7 • octa- 8 • nona- 9 • deca- 10 • --------- • Caution: We only write mono for the second element in a molecular compound. So CO would be carbon monoxide. Monocarbon monooxide is incorrect. • --Formula Writing Resources-- • • Writing Formulas for Molecular compounds: • Naming and Formula Writing for Molecu... • • Introduction to Formula Writing: • Introduction to Naming and Formula Wr... • For a complete tutorial on naming and formula writing for compounds, like Phosphorus trichloride and more, visit: • http://www.breslyn.org/chemistry/naming • Drawing/writing done in InkScape (http://www.InkScape.org). Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).
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