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Chemistry



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4 a unit of mass equal to one-twelfth the mass of a carbon-12 atom
5 the weighted average of the masses of the isotopes of an element
6 a subatomic particle with no charge and a mass of 1 amu; found in the nucleus of an atom
7 the tiny, dense central portion of an atom, composed of protons and neutrons
8 the number of protons in the nucleus of an atom of an element
9 the total number of protons and neutrons in the nucleus of an atom
10 a stream of electrons produced at the negative electrode (cathode) of a tube containing a gas at low pressure
11 A negatively charged subatomic particle
12 positively charged particle in the nucleus of an atom
1 the smallest particle of an element that retains its identity in a chemical reaction
2 atoms of the same element that have the same atomic number but different atomic masses due to a different number of neutrons
3 the first theory to relate chemical changes to events at the atomic level
 
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