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A step-by-step explanation of how to draw the P4 Lewis Dot Structure (Tetraphosphorus ). • The Lewis structure for P4 is more challenging than other Lewis structures because we the Phosphorous atoms are bonded in the shape of a pyramid with a triangular base. Once you understand this the structure makes more sense. • For the P4 structure use the periodic table to find the total number of valence electrons for the P4 molecule. Once we know how many valence electrons there are in P4 we can distribute them around the central atom with the goal of filling the outer shells of each atom. • In the Lewis structure of P4 structure there are a total of 20 valence electrons. P4 is also called Tetraphosphorus . • ---- Steps to Write Lewis Structure for compounds like P4 ---- • 1. Find the total valence electrons for the P4 molecule. • 2. Put the least electronegative atom in the center. Note: Hydrogen (H) always goes outside. • 3. Put two electrons between atoms to form a chemical bond. • 4. Complete octets on outside atoms. • 5. If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds. • ---- Lewis Resources ---- • • Lewis Structures Made Simple: • How to Draw Lewis Structures: Five Ea... • • More practice: • Lewis Dot Structure Practice Problems... • • Counting Valence Electrons: • Finding the Number of Valence Electro... • • Calculating Formal Charge: • Formal Charges: Calculating Formal Ch... • • Exceptions to the Octet Rule: • Exceptions to the Octet Rule • Lewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule, such as Tetraphosphorus . This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension). • Chemistry help at https://www.Breslyn.org

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