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15 Cards in this Set
- Front
- Back
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What does atom mean in Greek |
Indivisible |
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What does the nucleus contain |
Protons Neutrons |
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What is contained in the "rings" around the nucleus |
Electrons |
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The atom is mostly _________ |
empty space |
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How does an atom remain stable |
There is a balance between the nucleus and electrons |
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What part of the atom has a positive charge |
Protons |
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What part of the atom has negative charge |
Electrons |
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What part of the atom has no charge |
Neutrons |
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What is the atomic mass equal to |
The number of neutrons and protons added together |
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What is the atomic number equal to |
The number of protons in the element |
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What are isotopes |
An atom with the same number of protons but varying number of neutrons |
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When does radioactivity occur |
When the nucleus has too many neutrons and the atom disintegrates radioactively to achieve a stable state |
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What is a radioactive isotope |
An atom with same number of protons but different number of neutrons that has not started to disintegrate |
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What is a chemical compound |
Any quantity of one type of molecule |
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What is a molecule |
Atoms of various elements that combine |
