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U3 atomic structure
| Question | Answer |
|---|---|
| What are atoms? | smallest part of an element that still has the elements properties. |
| greek Philosopher of 4th century B.C. | Demetrius |
| Demetrius said | the universe is made of invisible particles called atoms. |
| Atoms (greek meaning) | unable to divide |
| Atoms cannot be broken down | was just a theory |
| 1700s scientist made | more careful measurements to get more reliable data |
| School Teacher in 1808 | dalton |
| Dalton came up with | Atomic Theory that is still true today and the basis of modern atomic |
| Dalton proposed that | atoms can be divided,and atoms of a different element can join to form compounds. |
| subatomic particles have | 3 types |
| 3 types of subatomic particles | protons, neutrons, and electrons |
| after 100 years | scientist discovered atoms can be broken down into smaller parts. |
| what are identicle in size and mass | protons and neutrons |
| the nucleus of an atom is | very small |
| if the nucleus was a size of a marble | the atom would be the size of a football field |
| atoms have | no charge |
| Atoms have | positive protons and negative electrons because their charges are equal in magnitude and opposite in signs |
Created by:
btiffany
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