Use tabulated electrode potentials to calculate for each reaction at 25 oC.
Chem 1010 Notes Chase Bobier Week 5 Notes. Important terms Things you need to know Atoms, Isotopes, and the Periodic Table of the Elements. Isotopes Isotopes are varieties of one element with a different number of neutrons in the nucleus. This change in atomic mass causes them to act in a slightly different manner than the original version of the element. Atoms have a neutral charge (The number of protons and electrons is even) Cations have a positive charge (The number of protons is greater than the number of electrons) Anions have a negative charge (The number of electrons outweighs the number of protons.) Atomic mass is the weight of a specific atom or isotope. It will always be a whole number. Atomic Weight is the average atomic mass of all known isotopes of an element, weighted in proportion of their natural abundances. How to perform a weighted average: (using Mg as the example) 1. Find atomic mass of all isotopes of given element. 2. Find the natural percentage of abundance of all of those isotopes. 3. Multiply each elements mass number by it’s % of abundance. 4. Average those numbers. Here’s an example: I want the atomic weight of Mg, I follow the fist step and find all of the isotopes of Mg, then I find the atomic masses of those isotopes and the % abundance of each. It looks like this (Table1) Symbol Mass # Isoto