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Pearson Chemistry Chapter 4 Vocabulary
Terms in this set (7)
the smallest particle of an element that retains its identity in a chemical reaction.
Dalton's atomic theory
1) elements are composed of atoms. 2) atoms of same element are identical, but differ from other elements. 3) atoms of elements can physically mix together or chemically combine in simple whole-number ratios to form compounds 4) chemical reactions occur when atoms are separated from each other, joined, or rearranged in a different combination.
the number of protons in the nucleus of an atom of that element.
the total number of protons and neutrons in an atom.
atoms that have the same number of protons but different numbers of neutrons.
Atomic mass unit (amu)
one twelfth the mass of a carbon-12 atom.
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