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Ionic and Covalent Compound Help (page 2)

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By — McGraw-Hill Professional
Updated on Aug 28, 2011

Covalent Compounds

Not all compounds are ionic. When non-metals react with other non-metals, covalently bonded compounds form. Covalent compounds are generally soft solids with low melting points. Many are liquids or gases at room temperature. When only two elements are bonded, the compound is called a binary covalent compound .

Atomic Number and Ions Covalent Compounds

Fig. 9.2. A few clues to chemical naming can make bonding a lot easier to understand.

To name a binary covalent compound, the IUPAC method orders the non-metals in a certain way. This order lists which non-metals to name first:

B > Si > C > P > N > H > S > I > Br > Cl > O > functional group

In a compound containing phosphorus and oxygen, phosphorus is named before oxygen.

For binary compounds, chemical naming includes writing the number of atoms of each type of element. These are given by a Greek prefix. Table 9.2 gives some Greek prefix tips to chemical naming.

To name a binary covalent compound, name the first non-metal, including its prefix, then name the second non-metal, using the prefix and changing the ending to “ide.” (Note: the prefix mono is generally not used for the first non-metal in the formula.)

Examples

Name the following compounds: CO, CO 2 , NO 2 , N 2 O 3 , CCl 4 , SF 6 . Did you get carbon monoxide, carbon dioxide, nitrogen dioxide, dinitrogen trioxide, carbon tetrachloride, and sulfur hexafluoride?

Atomic Number and Ions Covalent Compounds

 Practice problems for these concepts can be found at – Atomic Number and Ions Practice Test

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