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15 Cards in this Set
- Front
- Back
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Atom |
The smallest unit of an element that maintains the properties of that element |
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Nucleus |
In physical science an atoms central region which is made up of protons and neutrons |
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Electron |
A subatomic particle that has a negative charge. |
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Proton |
A subatomic particle that has a positive charge |
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Electron cloud |
A region around the nucleus of an atom where electrons are likely to be found |
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Isotope |
Atoms that have the same number of protons but different number of neutrons |
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Atomic number |
The number of protons in the nucleus of an atom |
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Neutron |
A subatomic particle that has a neutral charge. |
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Atomic mass |
The mass of an atom expressed in atomic mass units |
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Atomic mass unit |
A unit of mass that describes the mass of an atom or molecule |
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Mass number |
The sum of the numbers of protons and neutrons in the nucleus |
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Subatomic particles |
They are much smaller than an atom |
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Radioactive |
Atoms that fall apart after time. As they fall apart they give off particles. |
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Theory |
Ideas that explain many related observations and is supported by a large body of evidence |
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Law |
A statement or equation that reliably predicts events under certain conditions |
