| Chance | Vocabulary | Problems | Discovery |
|---|---|---|---|
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The thought that electrons were mixed throughout an atom, like plums in a pudding.
What did the Plum-Pudding Model (chocolate chip ice-cream model) represent?
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An atom.
The smallest unit of an element that maintains the properties of that element.
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64
How many protons does an atom with an atomic number of 64 and a mass number of 78 have?
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He propose that electrons are located in levels at certain distances from the nucleus.
What did Niels Bohr discover after studying the way that atoms react to light?
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When an atom loses one or more electrons.
How does an atom become a positively-charged ion?
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What is an atomic number?
The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.
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The diameter of an atom is 100,000 times bigger than the diameter of a nucleus.
How does the diameter of an atom compare to the diameter of a nucleus?
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A Greek philosopher named Democritus
Who thought of the idea that you would eventually end up with a particle that could not be cut?
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All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.
What is the Atomic Theory?
|
A region around the nucleus of an atom where electrons are likely to be found.
What is an electron cloud?
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The Electron-Cloud Model
What model represents the current atomic theory?
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J. J. Thomson
Who discovered electrons?
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Aristotle
Who disagreed with Democritus’s idea that you would eventually end up with a particle that could not be cut?
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An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
What is an isotope?
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When an electrons lose one or more electrons.
How does an atom become a positively-charged ion?
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He made a new model of the atom, he proposed that in the center of the atom is a tiny, extremely dense, positively charged part called the nucleus.
What revision did Ernest Rutherford make to the Atomic Theory?
|
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Gravitational force
Electromagnetic force Strong force Weak force.
What are the four basic forces at work everywhere in nature?
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Atomic Mass Unit (AMU)
What is a unit of mass that describes the mass of an atom or molecule?
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Objects with the same charge repel each other, while objects with the opposite charge attract each other.
What is an Electromagnetic Force?
|
He developed the Atomic Theory.
What did John Dalton do?
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