Inorganic Chemistry - Atomic Structure
Inorganic Chemistry - Atomic Structure
Biology 2121Chapter 2
Biology 2121Chapter 2
Introduction
• (1). Cells are the basic units of living organisms– Atoms ----- elements --- compounds (molecules)– Matter
• (2). Elements – 116 total (92 naturally occuring)– 96% of body (C,O,H,N)
• 20 trace elements
• (3). Inorganic vs Organic Chemistry
Atomic Structure
• (1). What are atoms made of?– Nucleus (protons and neutrons)– Energy levels (electrons)
• (2). Properties– Neutrons (0, 1 amu)– Proton (+1, 1 amu)– Electron (-1, 1/2000 amu)– Marieb link
Elements and the Periodic Chart
• (1). Metals and Nonmetals
• (2). Atomic Number– Protons
• (3) Mass Number – Protons + electrons– Mass of the atom!
Elements and the Periodic Chart
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
Valance Electrons and Planetary Models
• (1). Valance electrons – Outer shell electrons– Involved in bonding
• (2). Drawing Planetary Models of atoms – Periodic chart (appendix C)
Valence Shells
Why are valence electrons important?
• Valence electrons are involved in bonding
• Electrons – Transferred from one atom to another– Shared between atoms
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