CHECK THIS OUT FOR MORE ON SIG FIG'S
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/sig-figs-pre-alg/v/significant-figures
ISOTOPES EXPLAINED
Here is a quickie video on isotopes and isotopic mass calculations: https://www.youtube.com/watch?v=Q2rztYZiDA4 https://www.youtube.com/watch?v=J1XJpY2dxUI Counting protons neutrons and electrons: https://www.youtube.com/watch?v=CbckWatyxx0
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