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| Proposed the first atomic theory. "Everything is composed of empty space and tiny particles called atoms." |
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| Father of the modern atomic theory. "All matter is composed of tiny particles called atoms." |
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| The changing atom models and who proposed each: |
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Dalton: an atom is the smallest indivisible particle of matter.
Thomson: "Plum-Pudding"
Rutherford: Gold Foil Experiment.
Bohr: "Planetary Model"
Present: Electron Cloud. |
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| The smallest unit of an element that can exsist alone or can enter into a combination with other atoms. |
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| dense, positively charged central core of the atom. |
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| the area outside the nucleus. |
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| Protons were discovered by: |
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| Neutrons were discovered by: |
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| Electrons were discovered by: |
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| Each block on the periodic chart must contain what three things? |
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| Symbol, Atomic Number, and Atomic Mass |
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| represents one atom of the element. |
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| the number of protons in the atom. |
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| the average mass of the masses of the isotopes of an element. |
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| a substance which contains atoms with the same number of protons. |
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| the sum of the number of protons and nuetrons in an atom. |
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| any individual atom containing a definate number of protons and nuetrons. |
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| different atoms which contain the same amout of protons, but different amounts of nuetrons. |
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| an atom or group of atoms which possess an overall electrical charge formed by gaining or losing electrons. |
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Definition
| metals formed positive ions by losing electrons. |
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Definition
| nonmetals formed negative ions by gaining electrons. |
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