Lesson 1: Atomic Theory
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10 Terms
Atom
The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
Electron
A tiny, negatively-charged particle that moves around the outside of the nucleus of an atom
Nucleus
The central core of an atom, which contains protons & neutron
Proton
A small, positively charged particle that is found in the nucleus of an atom
Neutron
A small particle in the nucleus of the atom, with no electrical charge
Atomic number
The number of protons in the nucleus of an atom
Isotope
An atom with the same number of protons & a different number of neutrons from other atoms of the same element
Mass number
The sum of protons & neutrons in the nucleus of an atom
Theory
An explanation that may change with new evidence
Scientific law
Considered true & doesn’t change over time
Note 
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