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# Writing Binary Cds

### Writing formulas for binary compounds

Question | Answer |
---|---|

Chemical formula indicates | The relative number of atoms of each kind in a chemical compound |

When there is no subscript written next to an atom's symbol, the value of the subscript is | 1 |

Compounds composed of two elements are known as | binary compounds |

In a binary compound the total number of positive charges and negative charges must | Be equal |

Write the formula for the binary ionic compound: Potassium and iodine | KI |

Write the formula for the binary ionic compound: Magnesium and chlorine | MgCl2 |

Write the formula for the binary ionic compound: Sodium and sulfur | Na2S |

Write the formula for the binary ionic compound: aluminum and sulfur | AI2S3 |

Write the formula for the binary ionic compound: aluminum and nitrogen | AIN |

The Stock System uses what to indicate an ion's charge if it has more than 1 oxidation number | A Roman numeral |

Where is the Roman numeral placed in the Stock System when indicating a charge | The numeral is enclosed in parentheses and placed immediately after the metal name |

Names of metals that commonly form only one cation do not include | a Roman Numeral |

Write the formula for cooper (II) bromide | CuBr2, |

Write the formula foriron (II) oxide | FeO, |

Write the formula for lead (II) chloride | PbCI2, |

Write the formula for mercury (II) sulfide | HgS, |

Write the formula for tin (II) fluoride | SnF2, |

Write the formula for iron (III) oxide | Fe2O3, |