mass+number,+isotopes,+calculation+of+relative+atomic+mass


 * //Mass number, isotopes, calculation of relative atomic mass// **


 * Videos**

Comparing isotopes and relative isotopic mass || media type="custom" key="22855536" Calculation relative atomic mass || media type="custom" key="22876844" The history of the comparison to carbon-12 ||
 * media type="custom" key="22855524"


 * Common Misconceptions:**
 * Carbon 12 is used as a comparison because of it's chemical properties.
 * All elements only have 1 isotope.
 * Relative Isotopic Mass and Relative Atomic Mass are the same thing.

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 * Interesting facts:**
 * Isotopes of an element still have the same number of protons even if their neutron number differs. This means that isotopes of the same element will have the same number of electrons. Since electronic configuration is mostly responsible for chemical properties, these isotopes will undergo the same chemical reactions.
 * Mass is a fundamental property of objects, whereas weight is a force. Weight is the force F exerted on a mass m by a gravitational field.
 * Although mass numbers are whole numbers, the actual masses of individual atoms are never whole numbers (except for carbon-12).


 * Resources:**
 * Isotopes and atomic mass simulation from PhET.
 * Topic summary and exercises on atomic mass from UC Davis Chemwiki.
 * Inside the Atom from School Science.