When trying to figure out how many molecules are in one mole of a pure substance, we use Avogadro's number (6.022 x 10^23). Molar Mass- Mass of one mole of a pure substance. |
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 Works Cited Davis, R., Frey, R., Sarquis, M., & Sarquis, J. (2009). Modern chemistry. Orlando, FL: Holt, Rinehart, and Winsten "Science Notes and Projects." Science Notes and Projects. N.p., 31 May 2013. Web. 03 Oct. 2013. |
Atomic Number- The number of protons and electrons each atom of that element. As you can see to your left, the atomic number in oxygen is eight, which means there is eight protons and eight electrons. Mass Number- The total number of protons and neutrons that make up the nucleus of an isotope. For an example, the 15.999 would be the atomic mass of oxygen. To know the number of neutrons, you take the mass number minus atomic number. Isotope- atoms of the same element that have different masses. Nuclide is a general term for a specific isotope of an element (p. 70). |
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