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Lecture 2

CHEM 1210 Lecture Notes - Lecture 2: Bohr Model, Digestion, Unified Atomic Mass Unit


Department
Chemistry
Course Code
CHEM 1210
Professor
Kuntz
Lecture
2

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Atoms, Ions, and the Periodic Table
I. Elements and the structure of the atom
A. Introduction
a. Atoms- the smallest characteristic part of an element
-inside the nucleus are
the:
1. Pr
ot
o
n
s
(p^+)- 1 amu- relative charge: + (atomic mass
unit- very small fraction of a gram)
2. Neutrons (n^0)- 1 amu- relative charge: 0
-Outside the nucleus in the electron cloud:
a..1. Electrons (e^-)- 0 amu- relative charge: -
b. Element- a fundamental substance that cannot be broken down into simpler
substances by chemical means
-Modern definition: all atoms in the substance have the same number of
protons
c. Chemical symbols- indicates the number of protons in the atom
d. Compounds- made of 2 or more elements chemically combined
-Subscript indicates how much of each element
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