Ionic compounds writing formulas from

Name five metals and five nonmetals that are very likely to form ionic compounds. Write formulas for compounds that might result from the combination of these metals and nonmetals. Name these compounds. 

Write the formula for the binary ionic compound that forms from each pair of elements. (Chapter 8)... 

From the periodic table, select three sets of elements that would form ionic compounds. Write the formulas of the compounds. 

You are given that potassium and oxygen ions form an ionic compound the formula for the compound is the unknown. First, write out the symboi and oxidation number for each ion invoived in the reaction. Potassium, from group 1, forms 1-F ions, and oxygen, from group 16, forms 2- ions. 

Sodium chloride is not the only ionic compound that forms from sea water. Identify four other compounds that could be formed that contain the sodium ion. Write both the formula and the name for each compound. 

WRITING FORMULAS FROM NAMES OF IONIC COMPOUNDS 103... 

Writing Formulas from Names of Ionic Compounds... 

Writing Formulas for Ionic Compounds Write a formula for the ionic compound that forms from aluminum and oxygen. Write a formula for the ionic compoimd that forms from magnesium and oxygen. 

Write a formula for the ionic compoxmd that forms from each pair of elements. (a) sodium and sulfur (b) strontium and oxygen (c) aluminum and sulfur (d) magnesium and chlorine 54. Write a formula for tire ionic compound that forms from each pair of elements. (a) aluminum and oxygen (b) beryllium and iodine (c) calcium and sulfur (d) calcium and iodine... 

The formula for an ionic compound is written from the hrst part of the name that describes the metal ion including its charge, and the second part that specifies the nonmetal ion. Subscripts are added as needed to balance the charge. The steps for writing a formula from the name of an ionic compound are shown in Sample Problem 6.4. 

Guide to Writing Formulas from the Name of an Ionic Compound... 

D.ll Write the formula for the ionic compound formed from (a) zinc and fluoride ions (b) barium and nitrate ions (c) silver and iodide ions (d) lithium and nitride ions (e) chromium(IIl) and sulfide ions. 

Writing the formula for ionic compounds requires us to know the charge of the cation and anion making up the ionic compound. Information on the charge of common ions can be obtained from the periodic table. More will be said about this in Chapter 7, but for now, a few basic rules will help us write the formulas for simple ionic compounds ... 

To work out the formula of an ionic compound using Lewis symbols, we first represent the cation by removing the dots from the symbol for the metal atom. Then we represent the anion by transferring those dots to the Lewis symbol for the nonmetal atom to complete its valence shell. We may need to adjust the numbers of atoms of each kind so that all the dots removed from the metal atom symbols are accommodated by the nonmetal atom symbols. Finally, we write the charge of each ion as a superscript in the normal way. A simple example is the formula of potassium chloride ... 

Answer Notice how the arrows crisscross as they move toward the subscript position. That is where the name comes from. The method makes formula writing for ionic compounds quick and easy. There is one thing you need to pay attention to as you use this method, as the next example will demonstrate. 

The charges on the ions allow us to deduce the formula from the name of a compound, even though the numbers of each type of ion are not stated in the name. Writing formulas for ionic compounds requires deducing how many of each type of ion must be present to have a neutral compound (see Section 5.2). 

In writing formulas for ionic compounds from their names, we must remember the rules from Chapter 5. Be sure to balance the number of positive and negative charges The charges on the cations are implied for some cations (the constant type) and stated explicitly in the name for the others. The charge on a monatomic anion is equal to the group number minus 8 (see Section 5.2). 

In Chapter 5, we learned to write formulas for ionic compounds from the charges on the ions and to recognize the ions from the formulas of the compounds. For example, we know that aluminum chloride is AICI3 and that VCI2 contains ions. We cannot make comparable deductions for covalent compounds because they have no ions there are no charges to balance. To make similar predictions for species with covalent bonds, we need to use the concept of oxidation number, also called oxidation state. A system with some arbitrary rules allows us to predict formulas for covalent compounds from the positions of the elements in the periodic table and also to balance equations for complicated oxidation-reduction reactions. 

As we noted earlier, chemists have established different sets of rules for writing the names and formulas of different types of chemical compounds, so the first step in writing a name from a chemical formula is to decide what type of compound the formula represents. A chemical formula for an ionic compound will have one of the following forms. 

Before you can write a chemical formula from the name of a compound, you need to recognize what type of compound the name represents. For binary ionic compounds, the first part of the name is the name of a metallic cation. This may include a Roman numeral in parentheses. The anion name starts with the root of the name of a nonmetal and ends with -ide. 

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