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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What major contribution did Rutherford provide to the Atomic Theory? |
Discovered that atoms have a positive charge in the core (nucleus) and a negative charge outside the core, and that atoms are mostly empty space |
Repel |
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Who conducted the gold foil experiment? |
Ernest Rutherford |
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What major contributor did Thomson add to the Atomic Theory? |
Discovered that atoms can be split into smaller particles (protons and electrons) |
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Who developed the “plum pudding” model of an atom? |
J.J. Thomson |
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What does the “plum pudding” model show? |
An atom is a ball of positively charged material with negatively charged particles floating inside (like plums In English pudding). |
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What did Lavoisier contribute toward the Atomic Theory? |
Proposed the Law of Conservation of Matter, and created the metric system |
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What does the Law of Conservation of Matter State? |
- Atoms of the same element are exactly alike. - Atoms if different elements are different. - Atoms can join with other atoms to make new substances |
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What was Bohr’s contribution to the Atomic Theory? |
Electrons travel around the nucleus of an atom in definite paths, like the planet rotates the sun. Electrons can jump from one energy level (path) to another |
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What was Schrodinger’s contribution to the Atomic Theory? |
The exact location of an electron can not be found. Electrons travel in electron clouds which represent where the electron is likely to be found. |
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What was Chadwick’s contribution to the Atomic Theory? |
Discovered the existence of neutrons. He found that the Atomic mass of most elements is double the number of protons for one atom of that element |
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What does Bohr’s Atomic Model look like? |
Similar to the model of the solar system. The nucleus (with protons) is in the centre. Electrons orbit the nucleus in different levels |
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How many electrons can travel in each orbit (energy level) of an atom? |
First level (k) = 2 Second level (L) = 8 Third level (m) = 8 Fourth level (N) = 18 Fifth level (O) = 18 Sixth level (P) = 32 Seventh level (Q) = 32 |
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What is the Atomic Number equal to? |
The number of Protons |
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How do you calculate the number of Neutrons? |
Atomic mass - atomic number = number of neutrons |
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How do you determine the number of electrons in an uncharged atom? |
Protons - electrons |
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What was done in the gold foil experiment? |
A beam of positively charged particles was aimed at a piece of gold foil Most of the light passed through the foil in a straight line. Many particles bounced off the foil in different directions |
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What are protons? |
Positively charged particles |
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What are electrons? |
Negatively charged particles |
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What are neutrons? |
Neutral charged particles |
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Where are the protons and neutrons located in an atom? |
The nucleus (the core) |
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