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science
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| Term | Definition |
|---|---|
| element | the simplest pure substance of matter |
| matter | anything that has mass and takes up space |
| atoms | smallest particle of an element |
| molecules | two or more atoms chemically combined |
| compounds | two or more different atoms chemically combined |
| mixture | two or more substances that are not chemically combined and can be seperated |
| protons | carries a positive charge |
| neutrons | carries a no charge, when combined with protons forms the nucleus |
| electrons | carries a negative charge and circles the nucleus |
| Lewis dot diagram | a simplified way to show how electrons are arranged in their outer ring (valence electrons) |
| chemical symbol | used to represent the elements |
| atomic number | the number in the top left corner of an element that tells you how many protons and electrons there are |
| period | a row of elements across the periodic table (horizantal) |
| group | elements in the same column (vertical) |
| noble gasses | non metallic elements in group 18 |
| halogens | highly reactive non metallic elements in group 17 |
| Alkali metals | the 6 elements in group 1 |
| ions | atoms or a group of atoms that have an electric charge |
| covalent bonds | the chemical bond formed when two atoms share electrons |
| ionic bonds | the attraction between oppositley charged ions |
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