Chemistry 121, Week 3 Notes
Chemistry 121, Week 3 Notes 121
Popular in General Chemistry I
Popular in Chemistry
This 2 page Class Notes was uploaded by Brigette Honaker on Friday October 14, 2016. The Class Notes belongs to 121 at University of North Dakota taught by Dr. David Pierce in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Chemistry I in Chemistry at University of North Dakota.
Reviews for Chemistry 121, Week 3 Notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 10/14/16
Week Three Wednesday, September 7, 2016 2:28 PM September 7th, 2016 Structure of Atoms (1.7-1.8) Subatomic particles o Proton: positive charge (-e = 1.602 x 101C) Protons differentiate atoms from one another Atomic number = number of proton o Neutron: no charge Neutrons are important in isotopes Isotope: atoms that have extra neutrons Having additional neutrons in a nucleus can change the reactivity, usually making the isotope unstable. Ex) carbon-13 = carbon atom with an-19omic mass of 13 o Electron: negative charge (e = -1.602 x 10 C) Nucleus o Dense center made of protons and neutrons o Approximately 10 -1m Electron cloud o Occupied by electrons o Approximately 10 -1m Balanced atoms will have the same number of protons and electrons. Protons differentiate atoms from one another o Atomic number = number of protons Example: 84Kr has how many protons, neutrons, and electrons? o Protons = 36 o Neutrons = 84 - 36 = 48 48 o Electrons = 36 Classroom Question: Name the isotope with 13p and 14n o Aluminum-27 Avogadro's Number (1.8) Aka the mole 23 Measures the amount of a substance that contains 6.022 x 10 atoms The atomic mass on the periodic table is the average molar mass (M) in grams.
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'