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Counting Atoms

Counting Atoms. If there are no numbers , there is only one atom of each element present. Ex: LiBr Li: 1 Br: 1. If there is a number and only one element , there are that many atoms of that element. Ex: O 2 O: 2.

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Counting Atoms

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  1. Counting Atoms If there are no numbers, there is only one atom of each element present. Ex: LiBr Li: 1 Br: 1 If there is a number and only one element, there are that many atoms of that element. Ex: O2O: 2 If there are multiple elements and a number, there are that many atoms of the element the number is beside. There are only 1 of each of the other elements. Ex: CaSO4Ca: 1 S: 1 O: 4 If there are parenthesis, the number corresponds to all elements inside the parenthesis. Ex: Si(OH)4Si:1 O: 4 H: 4 If there are parenthesis with a number inside of the parenthesis, distribute (by multiplying) the number outside the parenthesis to the elements inside the parenthesis. Ex: Ca(NO3)2 Ca: 1 N: 2 O: 6

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