01:160:161 Lecture Notes - Lecture 6: Horse Length, U.S. Route 50 In Nevada, Alkali Metal

• School: Rutgers University
• Department: Chemistry
• Course: 01:160:161
• Professor: M Rabeony

Document Summary

Atoms: compose matter; the properties of atoms define the properties of matter. An atom is the smallest identifiable unit of an element: properties of protons, neutrons, electrons. You can identify an element by the number of protons. The number of neutrons can change, but the number of protons stays the same. Any more or less protons, it becomes a different element. In nature, an element chlorine has two isotopes: 37 cl: identify the atomic mass of chlorine: Atomic mass is the weighted average of the isotopes, which means the atomic mass is equal to. 5. 453amu: the atomic mass of chlorine is 35. 45 amu and chlorine has two isotopes cl-37 (36. 97 amu) and cl-35 (34. 97 amu). We can use that the percent adds up to 100% or the fraction abundance adds up to 1 (34. 97 amu) ? (36. 97 amu) One will be x and the other will be 100-x .