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Chapter 4 terms
Atoms and the Periodic table
5
Science
9th Grade
09/26/2008

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Term
nucleus
Definition
in a eukaryotic cell, a membrane-bound organelle that contains the cell’s DNA and that has a role in processes such as growth, metabolism, and reproduction
Term
proton
Definition
a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element
Term
neutron
Definition
a subatomic particle that has no charge and that is located in the nucleus of an atom
Term
electron
Definition
a subatomic particle that has a negative charge
Term
orbital
Definition
a region in an atom where there is a high probability of finding electrons
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