CHE 2A Study Guide - Simple Algebra, Fluorine, Oxidation State

• School: UC-Davis
• Department: Chemistry
• Course: CHE 2A
• Professor: A N D R E A S T O U P A D A K I S

Document Summary

Monatomic ions take their charge of monatomic ions: the oxidation number for an atom in its elemental form is always zero. A substance is elemental if both of the following are true: only one kind of atom is present. S8: the oxidation number of s = 0. Fe: the oxidation number of fe = 0. 1 when bonded to a metal: oxygen (o) has two possilbe oxidation numbers: When assigning oxidation numbers to the elements in a substance, take a systematic approach. Use rule 8 or 9 from above to calculate these. Yes, the sodium ion (na+) is monoatomic. Use rule 8 (and a little simple algebra) to find the oxidation number of s. Let s = oxidation number of sulfur. So: 2(+1) + s + 4(-2) = 0. Therefore, the oxidation number of s = +6. Yes, the potassium ion (k+) is monoatomic. Oxygen has a rule (-2 in most compounds).