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Chapter 2 Terms
Chemistry - Chapter 2 Terms
16
Chemistry
Undergraduate 1
09/07/2007

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Term
Atomic Mass Unit (amu)
Definition
1/12 the mass of a standard Carbon-12 atom.
Term
Proton
Definition
+ charged; mass of 1 amu.
Term
Electron
Definition
- charged; mass of 1/1836 amu.
Term
Neutron
Definition
no charge; mass of 1 amu.
Term
Nucleus
Definition
Dense core of atom containing protons & neutrons.
Term
Atomic Number
Definition
# of protons.
Term
Mass Number
Definition
Sum of protons and neutrons.
Term
Isotopes
Definition
Atoms of same element with different # of neutrons; different masses.
Term
Period
Definition
Horizontal row; 7 periods.
Term
Group
Definition
Veritcal columns; 18 columns.
Term
Main Group Elements
Definition
Elements in groups 1A-8A.
Term
Transition Metal Elements
Definition
Elements in groups 1-8B.
Term
Shell - Principle Energy Level
Definition
Volume of space in an atom that are similar in energy.
Term
Subshell
Definition
region within a shell that accommodates electrons of a particular energy value.
Term
Orbital
Definition
Region within a subshell that can accommodate a max. of 2 electrons.
Term
Electron Configuration
Definition
Specific arrangement of electrons within an atom according to increasing energy; (shell, subshell, orbital).
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