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| A representation that is used to describe and explain phenomena that cannot be experienced directly |
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Smallest unit of an element
From the Greek “atomos” meaning “indivisible” |
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The most central part of an atom
From the Latin “nucleus” meaning “kernel” or “inner part” |
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The area outside of and surrounding the nucleus of an atom
Contains the electrons |
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| Positively charged subatomic particle located inside the nucleus of the atom |
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Subatomic particle with no charge located inside the nucleus of the atom
No charge is also called neutral |
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| Negatively charged subatomic particle located outside the nucleus of the atom |
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| Representation of the structure of the atom |
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Theory describing atoms and their behaviors
It has five (5) basic points
All matter is made of atoms (still accepted as true)
Atoms cannot be made or destroyed (disproven)
All atoms of a given element are identical in mass and properties (disproven)
Compounds are formed by a combination of two (2) or more different kinds of atoms (still accepted as true)
A chemical reaction occurs when atoms are rearranged (still accepted as true) |
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Proposed by J.J. Thomson
Described the atom as a sphere of positively charged matter with the electrons randomly scattered throughout |
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Performed by Ernest Rutherford
Shot a stream of alpha particles at a piece of gold foil; expected the particles to go straight through; but they deflected all over the place
Rutherford proposed the existence of a dense, positive center in the atom; this center would later become known as the nucleus |
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| Holds an atom’s nucleus together |
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A well-substantiated explanation of some aspect of the natural world
Supported by experimental evidence that has been repeatedly tested and confirmed by multiple scientists |
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| scientists have their work reviewed by other scientists, experts in their field and related fields |
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| Process of experimentation used to explore observations and answer testable questions |
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Able to be trusted, authentic
Referring to reliable or credible sources of information |
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