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16 Cards in this Set
- Front
- Back
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Atomic Number |
The number of protons in the nucleus |
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Nuclues |
The small, dense center of positive charge in an atom |
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Isotope |
Same number of protons but different number of neutrons |
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Atomic mass |
Sum of number of neutrons and protons in a given nucleus |
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Electron |
A negatively charged particle that occupies the space around the nucleus of an atom |
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Proton |
A positively charged particle in an atomic nucleus |
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Neutron |
A negatively charged particle in the atomic nucleus with no charge |
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Democritus |
Believed in 2 things: 1. Empty space 2. Tiny invisible particles called "atomos" |
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Aristotle |
Challenge Democritus to prove his ideas but he couldn't do Aristotle's ideas reigned until 1700's. He beloved matter was continuous and made up of fire water earth and air |
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Lavoisier |
Known as father of modern chemistry. Came up with the law of conservation of matter which states the matter in the universe is constant it can't be created or destroyed |
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Proust |
Known for law of constant composition which states that a given compound always contains the same elements in the same proportions by mass |
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Atom |
The smallest particle of an element that retains the chemical identity of the elements |
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Thompson |
Did cathode ray experiment and came up with the plum pudding model |
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Rutherford |
Student of Thompson and came up with the gold foil experiment to prove Thompson's plum pudding model. |
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What did Rutherford discover |
That it was not a plum pudding at all but instead was
1. Most of the atom is empty space 2.There must be a small solid concentrated mass with a positive charge in the core of the atom. 3. The nucleus |
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Chadwick |
Discovered neutrons |
