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A&P Chapter 2 S1

TermDefinition
Matter Anything that occupies space and has mass
Element A pure substance that cannot be created or broken down by ordinary chemical means
Atom Smallest quantity of an element that maintains the element's unique properties
Proton Positively charged particles. The number of these in an atom's nucleus determines the element
Neutron Non-charged particles that, combined with protons, give mass to the atom
Electron Negatively charged particles that circle atoms at almost the speed of light. They are equal in number to the amount of protons
Atomic Number The number of protons in an atom's nucleus
Mass Number The sum of the number of protons and neutrons in an atom's nucleus
Isotope A distinct form of an element which differs by the number of neutrons
Radioisotope An isotope who's nucleus readily decays, spewing subatomic particles and electromagnetic energy
Compound Substance composed of two or more elements bound by chemical means
Electron Shell Layer of electrons that surround the nucleus at a distinct energy level
Valence Shell An atom's outermost electron shell
Created by: user-2030613
 

 



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