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sience
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| Question | Answer |
|---|---|
| Element | A mixture of atoms that form a element |
| Compounds | A mixture of 2 or more elements chemically combined |
| mixtures | A mixture of 2 or more elements not chemically combined |
| molecules | a group of two or more atoms held together by chemical bonds |
| atoms | the smallest part of a particle |
| protons | positively charged particles |
| neutrons | neutrally charged particles |
| electrons | negatively charged particles |
| Lewis dot structures | A model showing the atom's symbol and valence electrons |
| chemical bond | when elements are stuck together chemically |
| atomic number | the # of protons in a nucleus |
| period | a row in the periodic table |
| group | a column in the periodic table |
| noble gases | a group that does not need any more valence electrons |
| Halogens | a group that only has 7 valence electrons |
| alkali metals | a group that only has 1 valence electron |
| ions | a atom that has a negative charge |
| ionic bond | a transfer between to elements |
| covelent bonds | when 2 elements share an electron |
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