Binary compounds between nonmetals

Binary Compounds between Nonmetals. For binary compounds between nonmetals, that constituent should be placed first which appears earlier in the sequence ... 

The chemical properties of selenium fall between sulfur and tellurium. Thus, selenium reacts with oxygen similarly to sulfur, forming two oxides, selenium dioxide, Se02 and trioxide, SeOs. The metal combines with halogens forming their halides. With nonmetals, selenium forms binary compounds exhibiting oxidation states +4 and -i-6. 

A binary chemical compound contains only two elements the major types are ionic (compounds of a metal and a non-metal) and nonionic or molecular (compounds between two nonmetals). Answers depend on student responses, cation (positive ion)... 

Naming Binary Compounds Formed between Nonmetals... 

Table 2.6 Prefixes Used in Naming Binary Compounds Formed between Nonmetals ...

As shown in Figure 2.1, many nonmetals can have more than one oxidation number. (A more extensive list of oxidation numbers is given in Appendix Table B-15.) These numbers can sometimes be used in the same manner as ionic charges to determine formulas. Suppose, for example, you want to know the formula of a binary compound formed between sulfur and oxygen. From the common +4 and +6 oxidation states of sulfur, you could expect that sulfiu might form SO2 or SO3. Both are known compounds. Of course, a formula must represent facts. Oxidation numbers alone cannot be used to prove the existence of a compound. 

Binary compounds are those formed between two elements. If one of the elements is a metal and the other a nonmetal, the binary compoimd is usually made up of ions that is, it is a binary ionic compound. To name a binary compound of a metal and a nonmetal,... 

Ionic compounds consist of positive ions (cations) and negative ions (anions) hence, ionic compounds often consist of a metal and nonmetal. The electrostatic attraction between a cation and anion results in an ionic bond that results in compound formation. Binary ionic compounds form from two elements. Sodium chloride (NaCl) and sodium fluoride (NaF) are examples of binary ionic compounds. Three elements can form ternary ionic compounds. Ternary compounds result when polyatomic ions such as carbonate (C032 ), hydroxide (OH-), ammonium (NH4+), form compounds. For example, a calcium ion, Ca2+, combines with the carbonate ion to form the ternary ionic compound calcium carbonate, CaC03. Molecular compounds form discrete molecular units and often consist of a combination of two nonmetals. Compounds such as water (H20), carbon dioxide (C02), and nitric oxide (NO) represent simple binary molecular compounds. Ternary molecular compounds contain three elements. Glucose ( 12 ) is a ternary molecular compound. There are several distinct differences between ionic and molecular compounds, as summarized in Table 1.2. 

Binary covalent compounds are formed between two nonmetals. Although these compounds do not contain ions, they are named very similarly to binary ionic compounds. 

Learning the names of binary covalent compounds may also be troublesome because of the variety of naming schemes that exist. Covalent compounds are those that are mostly formed between two or more nonmetals. Like the compounds of the transition metals discussed earlier, nonmetals can exist in a variety of oxidation numbers. Thus naming schemes have also been devised to distinguish between two or more different compounds formed between the same two nonmetal elements. Examples are the compounds formed between carbon and oxygen (CO and CO2). 

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