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8 Cards in this Set
- Front
- Back
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Who was the first scientist to recognize the importance of careful measurements?
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Robert Boyle
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What percentage of the Earth's atmosphere does Oxygen make up?
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20%
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How many elements occur naturally?
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88
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The 9 most abundant elements account for ________ of the total mass
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98%
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What are the 5 main ideas of Dalton's atomic theory?
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1. Elements are made of tiny particles called atoms.
2. All atoms of an element are identical. 3. An element's atoms are different from another element's atoms. 4. Atoms from different elements can combine to form compounds. 5. Atoms are indivisible. |
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Who 'discovered' electrons and protons due to their charges?
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J.J. Thomson
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Who proved the plum pudding theory wrong?
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Rutherford
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A cation is ______ and an anion is ___________
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positive; negative
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