Formulas writing from ionic compound names

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. 

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. 

Randomly pick one card from Set A and one card from Set B. Write the proper formula for the ionic compound made from these two ions, and name the compound. 

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. 

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). 

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. 

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. 

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. 

Write the formula and name of the ionic compounds formed from atoms of each of the following pairs of elements ... 

WRITING FORMULAS FROM NAMES OF IONIC COMPOUNDS 103... 

Writing Formulas from Names of Ionic Compounds... 

Many ionic compounds contain either aluminum (a Group 3A metal) or a metal from Group lA or Group 2A and a nonmetal—oxygen, nitrogen, or a halogen (Group 7A). Write the chemical formulas and names of all the binary compounds that can result from such combinations. 

Writing the Formula from the Name of an Ionic Compound... 

Writing the name of a compound from its formula, or vice versa Given the formula of a simple compound (ionic, binary molecular, acid, or hydrate), write the name... 

Write the name from the formula or the formula from the name for each hydrated ionic compound. 

Write the formula and name of the compound formed from the following ionic interactions (a) The 2-1- ion and the 1 — ion are both isoelectronic with the atoms of a chemically unreactive Period 4 element, (b) The 2H- ion and the 2— ion are both isoelectronic with the Period 3 noble gas. (c) The 2-1- ion is the smallest with a filled d subshell the anion forms from the smallest halogen, (d) The ions form from the largest and smallest ion-izable atoms in Period 2. 

In a chemical formula, element symbols and, often, numerical subscripts show the type and number of each atom in the smallest unit of the substance. In this section, you ll learn how to write the names and formulas of ionic and simple covalent compounds, how to calculate the mass of a compound from its formula, and how to visuahze molecules with three-dimensional models. 

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