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S8-1.1AtomicTheory
Science 8 Atomic Theory
| Question | Answer |
|---|---|
| What is an atom? | the smallest particle that still can be considered an element |
| What does the Greek word "atomos" mean? | uncuttable |
| Why were models created to study atoms? | because atoms are so tiny and thus difficult to study |
| What is a scientific theory? | an explanation that may change with new evidence |
| What can cause a scientific theory to be revised? | more evidence |
| What did Dalton say about all atoms of the same element in terms of mass? | their mass is the same |
| How are compounds formed from simple atoms according to Dalton? | they combine in a specific ratio |
| What is an electron? | a negatively charged part of an atom |
| What charge do atoms in their normal state have: positive, negative, or neutral? | neutral |
| Who discovered electrons in the late 1800s? | Thompson |
| What is the dense core at the center of an atom? | nucleus |
| What is a proton? | a positively charged particle in the nucleus of an atom |
| Who discovered and named the proton? | Rutherford |
| Who created a model where the electrons orbit the nucleus like planets revolve around the Sun? | Bohr |
| What change did the cloud model bring to atomic theory? | electrons do not orbit like planets but move in a cloud around the nucleus |
| How did all the later models differ from Dalton's original atomic model? | Dalton thought the smallest part was the atom itself, but later models found smaller subatomic particles |
| What is a neutron? | a particle in the nucleus with no charge |
| What symbol is used for a proton? | + |
| What symbol is used for an electron? | e- |
| What subatomic particle fills most of the space in an atom? | electron |
| What 2 subatomic particles contain almost all the mass of an atom? | protons and neutrons |
| How many electrons does it take to equal the mass of 1 proton? | 1840 |
| What is the atomic number? | the number of protons in an atom |
| What are isotopes? | atoms with the same number of protons and different numbers of neutrons |
| What the mass number? | the sum of the protons and neutrons in an atom |
Created by:
mrdavis190
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