Binary compound A two-element

Binary ionic compound a two-element compound consisting of a cation and an anion. 

Solve Nitrogen must share a pair of electrons with three fluorine atoms to complete its octet. Thus, the binary compound these two elements form must be NF3 ... 

Although the general term carbide applies to the binary compounds of the element carbon, this term is used in systematic nomenclature only when carbon is the more electronegative of the two elements involved. Thus, C02 is called carbon dioxide and not oxygen carbide since oxygen is more electronegative than carbon. Although carbon forms binary compounds with most of the nonmetals, metalloids, and metals, only a few of the more common members of this class are considered here. 

The number of charges associated with a simple ion as A1+++ or Cl- determines its valence, the valence of aluminum thus being +3 and that of chlorine —1 in the compound aluminum chloride. Such a compound of two elements is called a binary compound, and the constituents are held by the forces of the primary valence. It is the purpose of this chapter to study the behavior of the non-metallic elements in binary compounds in which they show their primary negative valence. 

Figure 22 The correlation with experiment for equation (14). A minus sign indicates that there is at least one stable binary compound between the elements, that is, that AH < 0. A plus sign indicates that there is no stable binary compound known and also that there is limited solubility (<10%) of the two metals...

Although the term binary indicates exactly two elements, a few acids that contain more than two elements are named according to the rules for naming binary acids. If no oxygen is present in the formula for the acidic compound, the acid is named in the same way as a binary acid, except that the root of the second part of the name is the root of the polyatomic ion that the acid contains. For example, HCN, which is composed of hydrogen and the cyanide ion, is called hydrocyanic acid. 

Binary compound A compound made up of two, and only two, elements. 

Binary compound A compound consisting of two elements may be ionic or molecular. 

Binary compounds with two nonmetals are named with the element to the left or below in the periodic table named first. The other element is then named, with its ending changed to -ide and a prefix added to denote the number of atoms of that element present. If there is more than one atom of the first element present, a prefix is used with the first element also. If one of the elements is to the left and the other below, the one to the left is named first unless that element is oxygen or fluorine, in which case it is named last. The same order of elements is used in writing fomiulas for these compounds. The element with the lower electronegativity is usually named first. The prefixes are listed in Table 5.1. 

The simplest type of reaction is the direct combination of two elements to form a binary compound, A+B->AB. For example... 

Given the Lewis symbols for nitrogen and fluorine in Table 8.1, predict the formula of the stable binary compound (a compound composed of two elements) formed when nitrogen reacts with fluorine and draw its Lewis structure. 

Binary synthesis is the formation of a compound from two elements generdform element + element compound... 

SOLUTION From the formula it is a two-element compound and follows the rules for binary compounds. 

Many ionic compounds, such as NaCl, KBr, Znlj, and AI2O3, are binary compounds, that is, compounds formed from just two elements. For binary compounds, the first element named is the metal cation, followed by the nonmetallic anion. Thus, NaCl is sodium chloride. We name the anion by taking the first part of the element name (the chlor- of chlorine) and adding -ide. The names of KBr, Znh, and AI2O3 are potassium bromide, zinc iodide, and aluminum oxide, respectively. The -ide ending is also used in the names of some simple polyatomic anions, such as hydroxide (OH ) and cyanide (CN ). Thus, the compounds LiOH and KCN are named Uthium hydroxide and potassium cyanide, respectively. These and a number of other such ionic substances are ternary compounds, meaning compounds consisting of three elements. Table 0.3 lists the names of some common cations and anions. 

Nitrous anhydride (N2O3) was regarded by Dalton (since 12 October 1803, see p. 785) as a binary compound of two binary compound atoms (NO -f- NO2), and similarly some other complex compounds (e.g. alcohol). Dalton used to say, in his Quaker turn of speech Thou knows... no man can split an atom , and when referred to the sesquioxides (such as N2O3), apparently containing atoms of oxygen to i of the other element, he said Yes, but they are 3 atoms to 2. ... 

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