PPT Slide

Names and Formulas of Binary Covalent Compounds

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• Some simple covalent compounds, are so familiar that we use their common names: ammonia (NH3) water (H2O)

• Most are named in a systematic way using a few rules:

1. The element with the lower group number in the periodic  table is named first.

Important exception: If the compound contains oxygen and a halogen, the halogen is named first.

2. If both elements are in the same group, the one with the  higher period number is named first.

3. The second element is named with its root and the suffix  ì-ide.î

4. Use Greek numerical prefixes to indicate the number of  atoms of each element in the compound.

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