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Biology 11 Online
OpenStudy (anonymous):

help! check out my attachment in the comment box

OpenStudy (anonymous):

OpenStudy (anonymous):

Look at the legend of the periodic table on this page http://en.wikipedia.org/wiki/Valence_%28chemistry%29 . It indicates how many bonds an element usually forms. If Calcium (Ca) has a valency of 2 and Flourine (F) a valency of 1, then for every Calcium atom you would need two Flourine atoms, CaF2. Hope that helps.

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