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Electrons

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Across
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The number of protons plus the number of neutrons in the nucleus.
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A particle with an electric charge(-e) found inside and outside the nucleus.
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It is impossible to know variables precisely in the quantum world.
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The theory that describes matter and energy at a very small (atomic) sizes.
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An instrument that separates light into a spectrum.
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A nucleus is radio active if it is spontaneously breaks up, emitting particles 0r energy in the process.
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A particle found inside the nucleus with mass similar to the proton but with zero electric charge.
Down
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A bright, colored line in the spectroscope.
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The number of protons in the nucleus of an atom
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The smallest unit of electric charge that is possible in ordinary matter.
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A very small piece of something
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The core at the center of an Atom's mass and all of its positive charge.
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One of the discrete allowed energies for electrons in an Atom.
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Atoms of the same element that have different numbers of neutrons in the nucleus.