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Elements and Compound

Elements and Compound. Symbols . Elements T hat You Must Know. Elements are made up of one kind of atom and the symbol for each element is unique. . Compounds and Formulas .

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Elements and Compound

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  1. Elements and Compound Symbols

  2. Elements That You Must Know • Elements are made up of one kind of atom and the symbol for each element is unique.

  3. Compounds and Formulas • Compoundsare composed of more than one element and their formulas have more than one type of symbol showing the different elements that compose the compound.

  4. Chemical formulasare constructed from the symbols of the elements composing the substances. • In a chemical formula, the numbers as subscripts show how many of each kind of atom are in the compound.

  5. Subscripts • The subscript is written to the lower right of the element symbol. • If no subscript is written, only one atom of that element is part of the compound. For example: • H2O, the number 2 is the subscript for hydrogen and means that there are 2 atoms of hydrogen in the compound of water; since there is no subscript for oxygen it is assumed to be one atom of oxygen.

  6. You MUST know these Formulas. What elements and how many! • NaCl [salt], • H2O[water], • C6H12O6[simple sugar], • O2[oxygen gas], • CO2[carbon dioxide], • N2[nitrogen gas]).

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