The Phosphide is an monoatomic anion of Phosphorus, in which it is in its -3 oxidation state. Sodium phosphide is an example. In chemistry, a phosphide is a compound containing the P3− ion or its equivalent. Phosphide, any of a class of chemical compounds in which phosphorus is combined with a metal. phosphide: P3-arsenide: As3-aluminum ion: Al3+ This activity was created by a Quia Web subscriber. Hence, its neutral atom has 15 protons. Many different phosphides are known, with widely differing structures. Iron (III) phosphide is the chemical name for the compound having the formula FeP. First symbol is Sn from the name tin. Iron (III) phosphide has the weight of 86.82 grams per mole. Write ionic charge based on the Roman Numeral in the name. Phosphide is an ion. For example, the Iron (II) ion would be Fe 2+. Most commonly encountered on the binary phosphides, i.e. It is a reducing agent. (e.g. These ions are quite basic and release Phosphine gas on contact with Water. Sometimes it is more convenient to represent the elements by its Lewis electron dot symbol. Phosphide give P 3 ¯. P phosphorus P3-phosphide ion CN ¯ cyanide ion HCN (aq) hydrocyanic acid OH ¯ hydroxide ion O2 2-peroxide ion NO 2¯ nitrite ion HNO 2(aq) nitrous acid NO 3¯ nitrate ion HNO 3(aq) nitric acid CO 3 2-carbonate ion HCO 3¯ hydrogen carbonate ion H2CO 3(aq) carbonic acid SO 3 So, number of electrons is 18, just like what the first answerer stated. Iron (II) ion, Copper (I) ion, Cobalt (II) ion) Write the element symbol. Its formula is P3-. For Polyatomic Ions (e.g. sulfate ion, phosphite ion ammonium ion) Polyatomic ions are made up of two or more elements (they will be non-metals). You've seen the Bohr's diagram for the first 18 elements. The Roman numeral IV gives +4 as tin's charge. Its chemical formula is sometimes P 3-. Step #4 - since a formula must have zero total charge, you write the formula Fe 2 S 3. Phosphides ( chemical compounds having the phosphide ion in them) react with acids to make phosphine gas. They exhibit a wide variety of chemical and physical properties. those materials consisting only of phosphorus and a less electronegative element. This graphic summarizes example #4: Practice Problems Phosphorus is element number 15. Thus, the electron configuration becomes #["Ne"] 3s^2 3p^6# because the phosphorus atom gains three electrons that are added to the #3p# subshell. When the phosphide ion forms, the phosphorus atom gains three electrons. The Lewis Electron-Dot Symbols of Elements. The phosphide ion is P^3-. The phosphide ion is P3−, and phosphides of almost every metal in the periodic table are known. Gilbert N Lewis is widely known for his use of simple symbolic representations of elements that show valence electrons as dots. This compound's formula is Sn 3 P 4. This means that it has 3 more electrons than the number of protons. It does not always have that formula. 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