Which compounds would you predict to be ionic?

Strontium is not an essential element for higher life-forms, and its salts are generally nontoxic. Under controlled conditions, however, it has been used for treatment of some superficial cancers and bone cancer. The remaining polyatomic ions are all negatively-charged and, therefore, are classified as anions. Write the chemical formula for the ionic compound formed by each pair of ions.

(Remember that the convention for writing formulas for ionic compounds is not to include the ionic charge.) Sodium is a metal, and oxygen is a nonmetal; therefore, \(\ce{Na2O}\) is expected to be ionic. As has been repeatedly emphasized in several sections of this text, no two chemical formulas should share a common chemical name. Only one ion of each is needed to balance these charges. Rather than writing the formula as \(\ce{NaNaS}\), we shorten it by convention to \(\ce{Na2S}\). Which compounds would you predict to be ionic?

There are far more hydrogen carbonate ions (\(\ce{HCO3^{−}}\)) in blood than in seawater. Strontium Nitride. While both the nitrate ion and the sulfate ion share an "-ate" suffix, the former contains three oxygens, but the latter contains four.

Three fluorine 1− ions are needed to balance the 3+ charge on the aluminum ion.

Strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. Anonymous.

The amount of hydrogen phosphate ions—\(\ce{HPO4^{2−}}\) and \(\ce{H2PO4^{−}}\)—in seawater is very low, but they are present in higher amounts in blood, where they also affect acid-base properties.

Some ions consist of groups of atoms covalently bonded together and have an overall electric charge.

Therefore, \(\ce{OF2}\) is not ionic.

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When crossing charges, it is sometimes necessary to reduce the subscripts to their simplest ratio to write the empirical formula.

Legal. The formula for an ionic compound follows several conventions. Two sodium 1+ ions are needed to balance the 2− charge on the sulfur ion. Strontium compounds have rather limited commercial value because the corresponding calcium and barium compounds generally serve the same purpose yet are cheaper.

If we look at the ionic compound consisting of lithium ions and bromide ions, we see that the lithium ion has a 1+ charge and the bromide ion has a 1− charge.

Unfortunately, the relative nature of these suffixes mandates that the ion formula/ion name combinations of the polyatomic ions must simply be memorized. Because these ions contain more than one atom, they are called polyatomic ions. In the case of sodium chloride, the ratio of sodium ions to chloride ions, expressed in lowest whole numbers, is 1:1, so we use \(\ce{NaCl}\) (one \(\ce{Na}\) symbol and one \(\ce{Cl}\) symbol) to represent the compound. It is used as an ingredient in red signal flares and phosphors and is the principal health hazard in radioactive fallout.

The metal is an active reducing agent and readily reacts with halogens, oxygen, and sulfur to yield halides, oxide, and sulfide. 3.

When an ionic compound is formed from magnesium and oxygen, the magnesium ion has a 2+ charge, and the oxygen atom has a 2− charge.

10. Thus, we write \(\ce{Ca(NO3)2}\) as the formula for this ionic compound. [ "article:topic", "showtoc:no", "license:ccbyncsa" ].

Write the chemical formula for the ionic compound formed by each pair of ions. The easiest way to balance these charges is to assume the presence of two chloride ions for each magnesium ion: Now the positive and negative charges are balanced. Copy this to my account; E-mail to a friend; Find other activities; Start over; Help; From a list of almost 2000 names and formulas, students will be given the opportunity to practice their ability to name ionic compounds, given the formula, and determine the formula given the name. https://www.britannica.com/science/strontium, Los Alamos National Laboratory - Strontium, U.S. Environmental Protection Agency - Strontium, strontium - Student Encyclopedia (Ages 11 and up). Groups of atoms with an overall charge, called polyatomic ions, also exist. It is not an ionic compound; it belongs to the category of covalent compounds discuss elsewhere. After all, both liquids have ionic compounds dissolved in them. It is not an ionic compound; it belongs to the category of covalent compounds … What information is contained in the formula of an ionic compound?

Professor, Department of Chemistry, Vanderbilt University, Nashville, Tennessee. The chemical formula for strontium phosphate is Sr3(PO4)2. The empirical formula has one Pb4+ ion and two O2− ions. Table \(\PageIndex{2}\) lists the ion names and ion formulas of the most common polyatomic ions. Write the chemical formula for the ionic compound formed by each pair of ions.

Strontium hydroxide, Sr(OH)2, is sometimes used to extract sugar from molasses because it forms a soluble saccharide from which the sugar can be easily regenerated by the action of carbon dioxide.

Potassium ions have a charge of 1+, while sulfate ions have a charge of 2−. Both oxygen and fluorine are nonmetals. For example, the nitrate ion, which is symbolized as NO3−1, has one more oxygen than the nitrite ion, which is symbolized as NO2−1.

The most important commercial source of strontium is celestine; more than two-thirds of the world’s supply comes from China, with Spain and Mexico supplying much of the remainder. How well do you know their symbols? However, the sulfate ion is symbolized as SO4−2. To balance the positive and negative charges, we look to the least common multiple—6: two iron 3+ ions will give 6+, while three 2− oxygen ions will give 6−, thereby balancing the overall positive and negative charges.

Therefore, it is most likely an ionic compound. A macroscopic sample is composed of myriads of NaCl pairs; each individual pair called a formula unit. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Strontium monosulfide, SrS, is employed as a depilatory and as an ingredient in phosphors for electroluminescent devices and luminous paints. Additionally, both the nitrate ion and the sulfite ion contain three oxygens, but these polyatomic ions do not share a common suffix.

4 years ago.

Also note that this combination of nitrogen and oxygen has no electric charge specified, so it is not the nitrite ion. Strontium compounds have rather limited commercial value because the corresponding calcium and barium compounds generally serve the same purpose yet are cheaper. In contrast, the compound NO 2 contains two elements that are both nonmetals (nitrogen, from group 15 (or 5A), and oxygen, from group 16 (or 6A). Write the chemical formula for the ionic compound formed by each pair of ions.

This chemical formula says that there are one magnesium ion and two chloride ions in this formula. One of them is as an alloying agent for aluminum or magnesium in cast engine blocks and wheels; the strontium improves the machinability and creep resistance of the metal. We have already encountered some chemical formulas for simple ionic compounds. The rule for constructing formulas for ionic compounds containing polyatomic ions is the same as for formulas containing monatomic (single-atom) ions: the positive and negative charges must balance. Terms the ratio of each kind of ion in the compound. The formula \(\ce{Mg2Cl4}\) has balanced charges with the ions in a 1:2 ratio, but it is not the lowest whole number ratio. Write the chemical formulas for each binary ionic compound. This simplifies to its correct empirical formula PbO2. When an ionic compound is formed from magnesium and oxygen, the magnesium ion has a 2+ charge, and the oxygen atom has a 2− charge. Here is a comparison of the amounts of ions in blood and seawater: Most ions are more abundant in seawater than they are in blood, with some important exceptions. The formula for nitrate must be enclosed in parentheses. There are exceptions for certain ions, such as \(\ce{Hg2^{2+}}\).

By convention, the lowest whole number ratio is used in the formulas of ionic compounds. 5. The formula indicates that a single molecule of strontium phosphate contains three atoms of strontium, symbolized by Sr, two atoms of phosphorus, represented by P, and eight atoms of oxygen, indicated by the elemental symbol O. Thus, this compound is also ionic.

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The aluminum ion has a 3+ charge, while the fluoride ion formed by fluorine has a 1− charge. A 0.9% solution of sodium chloride approximates the salt concentration found in blood. Therefore, it is most likely an ionic compound. Unfortunately, much like the common system for naming transition metals, these suffixes only indicate the relative number of oxygens that are contained within the polyatomic ions. Strontium may be obtained in the form of sticks by the contact cathode method of electrolysis, in which a cooled iron rod, acting as a cathode, just touches the surface of a fused mixture of potassium and strontium chlorides and is raised as the strontium solidifies on it. Articles from Britannica Encyclopedias for elementary and high school students. In general, the chemistry of strontium is quite similar to that of calcium. This difference is significant because the hydrogen carbonate ion and some related ions have a crucial role in controlling the acid-base properties of blood. Remember that in an ionic compound, the component species are ions, not neutral atoms, even though the formula does not contain charges. Write the chemical formula for the ionic compound formed by each pair of ions. 4. A single suffix, "-ide," is insufficient for distinguishing the names of the anions in a related polyatomic series. Have questions or comments? A mineral from a lead mine near the village of Strontian, in Argyll, Scotland, was originally misidentified as a type of barium carbonate, but Adair Crawford and William Cruickshank in 1789 noted that it was likely a different substance.