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14 Cards in this Set
- Front
- Back
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Matter |
Anything that occupies space and has mass. |
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Mass |
A measure of the amount of material in an object. |
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Element |
A substance that cannot be broken down into other substances by chemical reactions. |
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Periodic table of elements |
A familiar fixture in any lab. |
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Trace elements |
Are required in only very small amounts, but you cannot live without them. |
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Atom |
Smallest unit of matter that still retains the properties of an element. |
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Proton |
A subatomic particle with a single unit of positive electrical charge. |
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Electron |
A subatomic particle with a single negative charge. |
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Neutron |
Electrically neutral no charge. |
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Nucleus |
The atoms central core. |
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Atomic number |
All atoms of a particular element have the same unique number of protons. |
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Mass number |
Sum of the number of protons and neutrons. |
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Atomic mass |
Is the bottom number, is close to mass number, represents an average of all the naturally occurring forms of that element. |
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Radioactive isotopes |
One in which the nucleus decays spontaneously, shedding particles and energy. |
