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ABurlingame Section 4 (Determining an Atom (Mass Number (the Total number…
ABurlingame Section 4
Determining an Atom
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Isotopes
Atoms with the same number of protons,
but different numbers of neutrons.
Examples
Neon-20
10 protons, 10 Neutrons, 10 Electrons
Neon-21
10 protons, 11 Neutrons, 10 Electrons
Neon-22
10 protons, 12 Neutrons, 10 Electrons
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Atomic Number:
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In a neutral atom, the atomic number = the # of protons and # of
electrons.
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Atomic Structure
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In the nuclear atom, the protons and
neutrons are located in the nucleus.
The atom
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Dalton's Atomic
Theory
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Atoms of the same element are identical. The atoms of any one
element are different from those of any other element.
Atoms of different elements can physically mix together or can chemically
combine in simple whole-number ratios to form compounds.
Chemical reactions occur when atoms are separated, joined, or
rearranged. Atoms of one element, however, are never changed
into atoms of another element as a result of a chemical reaction.
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