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atom

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Across
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Outside the nucleus and has a negative charge
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performed a CRT experiment and determined that the ray was composed of negative particles, call these electrons, determined the mass-charge ratio for an electron, came up with the "plum pudding" model of the atom
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The number of protons and nutrons
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developed the quarantined orbit model of the atom, electrons can only reside in certain energy levels
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Out side of the nucleus
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More than 2 element combined
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In side the object
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determined the Law of Conservation of Matter by extensive experimentation
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How many protons they have in the element
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A timeline of the atom
Down
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Fund the nutron
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It has a neutral charge
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The electrons on the otter shells
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The one who introduce atom
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expanded the idea that electrons behaved as particles AND waves, this developed the quantum mechanical model of the atom
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formulated an atomic theory of matter with 4 postulates: 1. Elements are composted of small particles called atoms. 2. All atoms of a given element are identical. * 3. Atoms are neither created nor destroyed in chemical reactions. 4. Compounds always contain the same proportion of elements.
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Has all the elements
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performed the gold foil experiment, determined that atoms contained a very small, positively charged core at the center, called this core the nucleus, came up with the nuclear model of the atom (with electrons orbiting around the nucleus)
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Made of on kind of material
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It has a positive charge