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How to Write Ionic Formulas

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Isabel Krause

on 12 December 2010

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Transcript of How to Write Ionic Formulas

Writing Ionic Formulas There are a series of simple steps to follow when writing Ionic Formulas.
With these steps, writing the formulas will become easy and simple. Always Remember Your charges Anions add -ide to their original name (ie. Bromine becomes bromide) Definitions- Anion- Negatively charged Ion
- Cation- Positively charged Ion To write the Cation first, then the Anion Cross Method Steps: 1. Write the Cation first, then the Anion
2. Cross the charges between ions to become subscripts- the charge of the cation becomes the subscript of the Anion and vice versa
- if there is no subscript, it is assumed to be one
3. Reduce Example- Lets combine Magnesium with Chlorine Mg Cl +2 -1 (We know that Magnesium would become Mg because it is in Group 2A. In order to become stable,
Magnesium drops 2 electrons, giving it 2 more protons (+2) than electrons in its Ionic Form). +2 (We Know that Chlorine would become Cl because It is in Group 7A. In order to become stable, Chlorine gains 1 electron, giving it one more electron (-1) than protons in its Ionic form). -1 Mg Cl +2 -1 New Formula= MgCl 2 (Any negative number become positive when becoming a subscript) (The -1 turns to a positive one, but writing the number 1 is unnecessary because it just signifies that there is 1 of that element present, and we already know that). Example- (Reducing)--Lets combine Hg with O +2 -2 Hg O +2 -2 The twos cancel out and you are left with one of each molecule HgO Now, this is where it gets more complex. Lets write the formulas for polyatomic Ions: Use parenthesis around polyatomic ions Example- Let's combine Ammonium with Phosphate NH PO 4 +1 4 -3 (NH ) PO 4 3 4 The end product is 3 Ammonium ions and one Phosphate Naming Ionic Compounds When naming a compound...... Name the Cation first, then the Anion Monatomic Cation keep their element name Monatomic anions (nonmetals) change their suffix to -ide If there is more than one form of the ion, use Romal Numerals to specify which one is in the compound If the compound contains a polyatomic ion, simply name the ion Example- NaBr Sodium Bromine Since Bromine is an ion and a nonmetal, the suffix changes to -ide Sodium Bromide Example- Ca Cl 2 Calcium Chlorine suffix changes to -ide Calcium Chloride Example- K SO 2 4 In order to name a polyatomic atom correctly, it helps if you do the Cross method backwards. K (SO ) 2 4 1 End products--- K +1 SO 4 +2 - The formula has to consist of a Cation first, and then an Anion so we know that the Charge on K has to be +1 and the charge on SO has to be -2. - Potassium Sulfate 4
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