1. Inorganic Chemistry - Atomic Structure
Biology 2121
Chapter 2

2. Introduction (1). Cells are the basic units of living organisms
Atoms ----- elements --- compounds (molecules)
Matter
(2). Elements
112 total (92 naturally occuring)
96% of body (C,O,H,N)
20 trace elements
(3). Inorganic vs Organic Chemistry

3. Atomic Structure (1). What are atoms made of? (2). Properties
Nucleus (protons and neutrons)
Energy levels (electrons)
(2). Properties
Neutrons (0, 1 amu)
Proton (+1, 1 amu)
Electron (-1, 1/2000 amu)
Marieb link

4. Elements and the Periodic Chart
(1). Metals and Nonmetals
(2). Atomic Number
# of Protons in nucleus
(3) Mass Number
Protons + electrons
Mass of a single atom!

5. Elements and the Periodic Chart

6. Average Atomic Mass and Isotopes
What are isotopes?
Same type of atoms with differing numbers of neutrons.
Average of all isotopes
Average atomic mass number
Not all isotopes –equal amounts

7. Valance Electrons and Planetary Models
Outer shell electrons
Involved in bonding
(2). Drawing Planetary Models of atoms
Periodic chart (appendix C)

8. Valence Shells

9. Why are valence electrons important?
Valence electrons are involved in bonding
Electrons
Transferred from one atom to another
Shared between atoms