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Science
Ch. 7
| Question | Answer |
|---|---|
| Atom | is the smallest piece of an element that still represents that element. |
| Electron | is a particle with one negative charge. |
| Nucleus | most of an atom's mass and positive charge is concentrated in a small area in the center of the atom. |
| Proton | is an atomic particle that has one positive charge. |
| Neutron | is a neutral particle that exists in the nucleus of an atom. |
| Electron Cloud | is an area around an atomic nucleus where an electron is most likely to be located. |
| Atomic number | number of protons in an atom of an element. |
| neutral atom | the number of electrons equals the number of protons. (the number of positive charges equals the number of negative charges) |
| Isotopes | are atoms of the same element that have different numbers of neutrons. |
| Mass Number | is the sum of the number of protons and neutrons in an atom. |
| Average atomic mass | is the average mass of the element's isotopes, weighted according to the abundance of each isotope. |
| Ion | is an atom that is no longer neutral because it has gained or lost electrons. |
Created by:
rdeller
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