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Definition
| Anything that has mass and takes up space |
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| The smallest particle of matter |
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Definition
| A pure substance that cannot be broken down into other substances. They are made of only one type of atom. |
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Definition
| Subatomic particle found in the nucleus of the atom; adds mass |
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Term
| What charge does a proton have? |
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Definition
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Definition
| Subatomic particle found in the nucleus of the atom; it adds mass |
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Term
| What charge does a neutron have? |
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Definition
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Definition
| Subatomic particle that orbits the nucleus |
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Term
| What charge does the electron have? |
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Definition
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Definition
| An atom with extra neutrons; may be radioactive |
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Definition
| A positively charged atom; it has lost electron(s) |
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Definition
| A negatively charged electron; it has gained electrons |
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Definition
| A unique number for each element; it tells us how many protons each atom has |
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Term
| What happens when we change the atomic number? |
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Definition
| We name a different element |
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Term
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Definition
| The average mass for an element; represents the number of protons + neutrons |
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Definition
| A one or two letter symbol that represents an element: C = carbon |
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| How many electrons can be found in the first three energy levels |
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Definition
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Definition
| A pure substance formed when two or more different elements combine. |
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Term
| What are two features of compounds? |
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Definition
| They always form from the same elements in the same fixed ratio. Ex: water is always H2O. They cannot be broken down into smaller units and still maintain their properties. |
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Term
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Definition
| A force that holds substances together |
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Definition
| A chemical bond that forms between atoms when they share electrons |
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Definition
| A chemical bond that forms between oppositely charged ions |
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Definition
| Group of atoms held together by covalent bonds |
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Definition
| A weak attraction between a H atom in one molecule and an electro-negative atoms (like O or N) in another molecule |
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Term
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Definition
| Weak interactions between positive and negative regions in molecules |
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Term
| What happens when we change the number of electrons in an atom? |
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Definition
| We form an ion, a charged atom |
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Term
| What happens when we change the number of neutrons in a atoms? |
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Definition
| We form an isotope, a heavier atom, which may also be radioactive |
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